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Finding the Fourth Proportional to 543,752.20, 815,628.30 and 319,220.20

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Solution

The fourth proportional to 543,752.20, 815,628.30 and 319,220.20 is: 478,830.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,752.20 : 815,628.30 = 319,220.20 : x
  2. Step 2: Convert to fraction form
    543,752.20/815,628.30 = 319,220.20/x
  3. Step 3: Cross multiply
    543,752.20x = 815,628.30 × 319,220.20
  4. Step 4: Simplify right side
    543,752.20x = 260,365,029,051.66
  5. Step 5: Solve for x
    x = 260,365,029,051.66/543,752.20
  6. Step 6: Final answer
    x = 478,830.30

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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.