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Finding the Fourth Proportional to 114.70, 171.75 and 66.40

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Solution

The fourth proportional to 114.70, 171.75 and 66.40 is: 99.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.70 : 171.75 = 66.40 : x
  2. Step 2: Convert to fraction form
    114.70/171.75 = 66.40/x
  3. Step 3: Cross multiply
    114.70x = 171.75 × 66.40
  4. Step 4: Simplify right side
    114.70x = 11,404.20
  5. Step 5: Solve for x
    x = 11,404.20/114.70
  6. Step 6: Final answer
    x = 99.43

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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.