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Finding the Fourth Proportional to 805,390.80, 1,208,086.20 and 385,486.80

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Solution

The fourth proportional to 805,390.80, 1,208,086.20 and 385,486.80 is: 578,230.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    805,390.80 : 1,208,086.20 = 385,486.80 : x
  2. Step 2: Convert to fraction form
    805,390.80/1,208,086.20 = 385,486.80/x
  3. Step 3: Cross multiply
    805,390.80x = 1,208,086.20 × 385,486.80
  4. Step 4: Simplify right side
    805,390.80x = 465,701,283,362.16
  5. Step 5: Solve for x
    x = 465,701,283,362.16/805,390.80
  6. Step 6: Final answer
    x = 578,230.20

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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.