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Finding the Fourth Proportional to 78,717.20, 118,306.20 and 68,579.60

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Solution

The fourth proportional to 78,717.20, 118,306.20 and 68,579.60 is: 103,070.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,717.20 : 118,306.20 = 68,579.60 : x
  2. Step 2: Convert to fraction form
    78,717.20/118,306.20 = 68,579.60/x
  3. Step 3: Cross multiply
    78,717.20x = 118,306.20 × 68,579.60
  4. Step 4: Simplify right side
    78,717.20x = 8,113,391,873.52
  5. Step 5: Solve for x
    x = 8,113,391,873.52/78,717.20
  6. Step 6: Final answer
    x = 103,070.13

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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.