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Finding the Fourth Proportional to 82.70, 114.18 and 66.40

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Solution

The fourth proportional to 82.70, 114.18 and 66.40 is: 91.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.70 : 114.18 = 66.40 : x
  2. Step 2: Convert to fraction form
    82.70/114.18 = 66.40/x
  3. Step 3: Cross multiply
    82.70x = 114.18 × 66.40
  4. Step 4: Simplify right side
    82.70x = 7,581.55
  5. Step 5: Solve for x
    x = 7,581.55/82.70
  6. Step 6: Final answer
    x = 91.68

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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.