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Finding the Fourth Proportional to 71.07, 97.79 and 65.27

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Solution

The fourth proportional to 71.07, 97.79 and 65.27 is: 89.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.07 : 97.79 = 65.27 : x
  2. Step 2: Convert to fraction form
    71.07/97.79 = 65.27/x
  3. Step 3: Cross multiply
    71.07x = 97.79 × 65.27
  4. Step 4: Simplify right side
    71.07x = 6,381.94
  5. Step 5: Solve for x
    x = 6,381.94/71.07
  6. Step 6: Final answer
    x = 89.80

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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.