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Finding the Fourth Proportional to 72,212.40, 99,680.40 and 64,645.02

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Solution

The fourth proportional to 72,212.40, 99,680.40 and 64,645.02 is: 89,234.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,212.40 : 99,680.40 = 64,645.02 : x
  2. Step 2: Convert to fraction form
    72,212.40/99,680.40 = 64,645.02/x
  3. Step 3: Cross multiply
    72,212.40x = 99,680.40 × 64,645.02
  4. Step 4: Simplify right side
    72,212.40x = 6,443,841,451.61
  5. Step 5: Solve for x
    x = 6,443,841,451.61/72,212.40
  6. Step 6: Final answer
    x = 89,234.56

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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.