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Finding the Fourth Proportional to 84.47, 116.39 and 66.02

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Solution

The fourth proportional to 84.47, 116.39 and 66.02 is: 90.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.47 : 116.39 = 66.02 : x
  2. Step 2: Convert to fraction form
    84.47/116.39 = 66.02/x
  3. Step 3: Cross multiply
    84.47x = 116.39 × 66.02
  4. Step 4: Simplify right side
    84.47x = 7,683.16
  5. Step 5: Solve for x
    x = 7,683.16/84.47
  6. Step 6: Final answer
    x = 90.96

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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.