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Finding the Fourth Proportional to 66, 98.70 and 38.87

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Solution

The fourth proportional to 66, 98.70 and 38.87 is: 58.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66 : 98.70 = 38.87 : x
  2. Step 2: Convert to fraction form
    66/98.70 = 38.87/x
  3. Step 3: Cross multiply
    66x = 98.70 × 38.87
  4. Step 4: Simplify right side
    66x = 3,836.47
  5. Step 5: Solve for x
    x = 3,836.47/66
  6. Step 6: Final answer
    x = 58.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.