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Finding the Fourth Proportional to 64.43, 88.94 and 39.87

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Solution

The fourth proportional to 64.43, 88.94 and 39.87 is: 55.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.43 : 88.94 = 39.87 : x
  2. Step 2: Convert to fraction form
    64.43/88.94 = 39.87/x
  3. Step 3: Cross multiply
    64.43x = 88.94 × 39.87
  4. Step 4: Simplify right side
    64.43x = 3,545.84
  5. Step 5: Solve for x
    x = 3,545.84/64.43
  6. Step 6: Final answer
    x = 55.04

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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.