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Finding the Fourth Proportional to 73.38, 109.56 and 64.74

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Solution

The fourth proportional to 73.38, 109.56 and 64.74 is: 96.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.38 : 109.56 = 64.74 : x
  2. Step 2: Convert to fraction form
    73.38/109.56 = 64.74/x
  3. Step 3: Cross multiply
    73.38x = 109.56 × 64.74
  4. Step 4: Simplify right side
    73.38x = 7,092.91
  5. Step 5: Solve for x
    x = 7,092.91/73.38
  6. Step 6: Final answer
    x = 96.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.