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Finding the Fourth Proportional to 66.31, 99.47 and 35.86

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Solution

The fourth proportional to 66.31, 99.47 and 35.86 is: 53.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.31 : 99.47 = 35.86 : x
  2. Step 2: Convert to fraction form
    66.31/99.47 = 35.86/x
  3. Step 3: Cross multiply
    66.31x = 99.47 × 35.86
  4. Step 4: Simplify right side
    66.31x = 3,566.99
  5. Step 5: Solve for x
    x = 3,566.99/66.31
  6. Step 6: Final answer
    x = 53.79

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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.