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Finding the Fourth Proportional to 78,717.80, 118,076.70 and 74,125.10

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Solution

The fourth proportional to 78,717.80, 118,076.70 and 74,125.10 is: 111,187.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,717.80 : 118,076.70 = 74,125.10 : x
  2. Step 2: Convert to fraction form
    78,717.80/118,076.70 = 74,125.10/x
  3. Step 3: Cross multiply
    78,717.80x = 118,076.70 × 74,125.10
  4. Step 4: Simplify right side
    78,717.80x = 8,752,447,195.17
  5. Step 5: Solve for x
    x = 8,752,447,195.17/78,717.80
  6. Step 6: Final answer
    x = 111,187.65

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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.