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Finding the Fourth Proportional to 66.31, 99.91 and 55.69

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Solution

The fourth proportional to 66.31, 99.91 and 55.69 is: 83.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.31 : 99.91 = 55.69 : x
  2. Step 2: Convert to fraction form
    66.31/99.91 = 55.69/x
  3. Step 3: Cross multiply
    66.31x = 99.91 × 55.69
  4. Step 4: Simplify right side
    66.31x = 5,563.99
  5. Step 5: Solve for x
    x = 5,563.99/66.31
  6. Step 6: Final answer
    x = 83.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.