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Finding the Fourth Proportional to 83.42, 115.02 and 64.74

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Solution

The fourth proportional to 83.42, 115.02 and 64.74 is: 89.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.42 : 115.02 = 64.74 : x
  2. Step 2: Convert to fraction form
    83.42/115.02 = 64.74/x
  3. Step 3: Cross multiply
    83.42x = 115.02 × 64.74
  4. Step 4: Simplify right side
    83.42x = 7,446.39
  5. Step 5: Solve for x
    x = 7,446.39/83.42
  6. Step 6: Final answer
    x = 89.26

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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.