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Finding the Fourth Proportional to 485,389.04, 728,459.51 and 390,850.73

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Solution

The fourth proportional to 485,389.04, 728,459.51 and 390,850.73 is: 586,578.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,389.04 : 728,459.51 = 390,850.73 : x
  2. Step 2: Convert to fraction form
    485,389.04/728,459.51 = 390,850.73/x
  3. Step 3: Cross multiply
    485,389.04x = 728,459.51 × 390,850.73
  4. Step 4: Simplify right side
    485,389.04x = 284,718,933,265.95
  5. Step 5: Solve for x
    x = 284,718,933,265.95/485,389.04
  6. Step 6: Final answer
    x = 586,578.82

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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.