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Finding the Fourth Proportional to 539,371.20, 809,931.60 and 390,655.20

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Solution

The fourth proportional to 539,371.20, 809,931.60 and 390,655.20 is: 586,616.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,371.20 : 809,931.60 = 390,655.20 : x
  2. Step 2: Convert to fraction form
    539,371.20/809,931.60 = 390,655.20/x
  3. Step 3: Cross multiply
    539,371.20x = 809,931.60 × 390,655.20
  4. Step 4: Simplify right side
    539,371.20x = 316,403,991,184.32
  5. Step 5: Solve for x
    x = 316,403,991,184.32/539,371.20
  6. Step 6: Final answer
    x = 586,616.40

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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.