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Finding the Fourth Proportional to 71.96, 99.29 and 65.31

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Solution

The fourth proportional to 71.96, 99.29 and 65.31 is: 90.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.96 : 99.29 = 65.31 : x
  2. Step 2: Convert to fraction form
    71.96/99.29 = 65.31/x
  3. Step 3: Cross multiply
    71.96x = 99.29 × 65.31
  4. Step 4: Simplify right side
    71.96x = 6,484.42
  5. Step 5: Solve for x
    x = 6,484.42/71.96
  6. Step 6: Final answer
    x = 90.12

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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.