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Finding the Fourth Proportional to 71.09, 97.47 and 64.15

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Solution

The fourth proportional to 71.09, 97.47 and 64.15 is: 87.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.09 : 97.47 = 64.15 : x
  2. Step 2: Convert to fraction form
    71.09/97.47 = 64.15/x
  3. Step 3: Cross multiply
    71.09x = 97.47 × 64.15
  4. Step 4: Simplify right side
    71.09x = 6,253.06
  5. Step 5: Solve for x
    x = 6,253.06/71.09
  6. Step 6: Final answer
    x = 87.96

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.