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Finding the Fourth Proportional to 539,940.60, 809,910.90 and 390,641.40

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Solution

The fourth proportional to 539,940.60, 809,910.90 and 390,641.40 is: 585,962.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,940.60 : 809,910.90 = 390,641.40 : x
  2. Step 2: Convert to fraction form
    539,940.60/809,910.90 = 390,641.40/x
  3. Step 3: Cross multiply
    539,940.60x = 809,910.90 × 390,641.40
  4. Step 4: Simplify right side
    539,940.60x = 316,384,727,851.26
  5. Step 5: Solve for x
    x = 316,384,727,851.26/539,940.60
  6. Step 6: Final answer
    x = 585,962.10

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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.