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Finding the Fourth Proportional to 72,432, 99,961.92 and 42,629.76

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Solution

The fourth proportional to 72,432, 99,961.92 and 42,629.76 is: 58,832.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,432 : 99,961.92 = 42,629.76 : x
  2. Step 2: Convert to fraction form
    72,432/99,961.92 = 42,629.76/x
  3. Step 3: Cross multiply
    72,432x = 99,961.92 × 42,629.76
  4. Step 4: Simplify right side
    72,432x = 4,261,352,658.74
  5. Step 5: Solve for x
    x = 4,261,352,658.74/72,432
  6. Step 6: Final answer
    x = 58,832.46

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1.5x scale

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.