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Finding the Fourth Proportional to 114.58, 171.78 and 66.43

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Solution

The fourth proportional to 114.58, 171.78 and 66.43 is: 99.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.58 : 171.78 = 66.43 : x
  2. Step 2: Convert to fraction form
    114.58/171.78 = 66.43/x
  3. Step 3: Cross multiply
    114.58x = 171.78 × 66.43
  4. Step 4: Simplify right side
    114.58x = 11,411.35
  5. Step 5: Solve for x
    x = 11,411.35/114.58
  6. Step 6: Final answer
    x = 99.59

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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.