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Finding the Fourth Proportional to 123,930.76, 170,984.06 and 72,236.04

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Solution

The fourth proportional to 123,930.76, 170,984.06 and 72,236.04 is: 99,662.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,930.76 : 170,984.06 = 72,236.04 : x
  2. Step 2: Convert to fraction form
    123,930.76/170,984.06 = 72,236.04/x
  3. Step 3: Cross multiply
    123,930.76x = 170,984.06 × 72,236.04
  4. Step 4: Simplify right side
    123,930.76x = 12,351,211,793.70
  5. Step 5: Solve for x
    x = 12,351,211,793.70/123,930.76
  6. Step 6: Final answer
    x = 99,662.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.