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Finding the Fourth Proportional to 539,078.20, 808,617.30 and 139,715.80

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Solution

The fourth proportional to 539,078.20, 808,617.30 and 139,715.80 is: 209,573.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,078.20 : 808,617.30 = 139,715.80 : x
  2. Step 2: Convert to fraction form
    539,078.20/808,617.30 = 139,715.80/x
  3. Step 3: Cross multiply
    539,078.20x = 808,617.30 × 139,715.80
  4. Step 4: Simplify right side
    539,078.20x = 112,976,612,963.34
  5. Step 5: Solve for x
    x = 112,976,612,963.34/539,078.20
  6. Step 6: Final answer
    x = 209,573.70

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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.