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Finding the Fourth Proportional to 78,493.80, 117,740.70 and 69,892.20

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Solution

The fourth proportional to 78,493.80, 117,740.70 and 69,892.20 is: 104,838.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,493.80 : 117,740.70 = 69,892.20 : x
  2. Step 2: Convert to fraction form
    78,493.80/117,740.70 = 69,892.20/x
  3. Step 3: Cross multiply
    78,493.80x = 117,740.70 × 69,892.20
  4. Step 4: Simplify right side
    78,493.80x = 8,229,156,552.54
  5. Step 5: Solve for x
    x = 8,229,156,552.54/78,493.80
  6. Step 6: Final answer
    x = 104,838.30

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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.