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Finding the Fourth Proportional to 71.62, 99.32 and 69.40

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Solution

The fourth proportional to 71.62, 99.32 and 69.40 is: 96.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.62 : 99.32 = 69.40 : x
  2. Step 2: Convert to fraction form
    71.62/99.32 = 69.40/x
  3. Step 3: Cross multiply
    71.62x = 99.32 × 69.40
  4. Step 4: Simplify right side
    71.62x = 6,892.81
  5. Step 5: Solve for x
    x = 6,892.81/71.62
  6. Step 6: Final answer
    x = 96.24

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.