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Finding the Fourth Proportional to 525,786.80, 788,680.20 and 385,818.80

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Solution

The fourth proportional to 525,786.80, 788,680.20 and 385,818.80 is: 578,728.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    525,786.80 : 788,680.20 = 385,818.80 : x
  2. Step 2: Convert to fraction form
    525,786.80/788,680.20 = 385,818.80/x
  3. Step 3: Cross multiply
    525,786.80x = 788,680.20 × 385,818.80
  4. Step 4: Simplify right side
    525,786.80x = 304,287,648,347.76
  5. Step 5: Solve for x
    x = 304,287,648,347.76/525,786.80
  6. Step 6: Final answer
    x = 578,728.20

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.