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Finding the Fourth Proportional to 78,486.10, 117,729.15 and 72,495.70

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Solution

The fourth proportional to 78,486.10, 117,729.15 and 72,495.70 is: 108,743.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,486.10 : 117,729.15 = 72,495.70 : x
  2. Step 2: Convert to fraction form
    78,486.10/117,729.15 = 72,495.70/x
  3. Step 3: Cross multiply
    78,486.10x = 117,729.15 × 72,495.70
  4. Step 4: Simplify right side
    78,486.10x = 8,534,857,139.66
  5. Step 5: Solve for x
    x = 8,534,857,139.66/78,486.10
  6. Step 6: Final answer
    x = 108,743.55

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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.