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Finding the Fourth Proportional to 71.96, 99.36 and 62.72

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Solution

The fourth proportional to 71.96, 99.36 and 62.72 is: 86.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.96 : 99.36 = 62.72 : x
  2. Step 2: Convert to fraction form
    71.96/99.36 = 62.72/x
  3. Step 3: Cross multiply
    71.96x = 99.36 × 62.72
  4. Step 4: Simplify right side
    71.96x = 6,231.86
  5. Step 5: Solve for x
    x = 6,231.86/71.96
  6. Step 6: Final answer
    x = 86.60

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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.