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Finding the Fourth Proportional to 66.38, 99.60 and 56.86

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Solution

The fourth proportional to 66.38, 99.60 and 56.86 is: 85.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.38 : 99.60 = 56.86 : x
  2. Step 2: Convert to fraction form
    66.38/99.60 = 56.86/x
  3. Step 3: Cross multiply
    66.38x = 99.60 × 56.86
  4. Step 4: Simplify right side
    66.38x = 5,663.26
  5. Step 5: Solve for x
    x = 5,663.26/66.38
  6. Step 6: Final answer
    x = 85.32

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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.