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Finding the Fourth Proportional to 114.45, 171.67 and 66.30

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Solution

The fourth proportional to 114.45, 171.67 and 66.30 is: 99.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.45 : 171.67 = 66.30 : x
  2. Step 2: Convert to fraction form
    114.45/171.67 = 66.30/x
  3. Step 3: Cross multiply
    114.45x = 171.67 × 66.30
  4. Step 4: Simplify right side
    114.45x = 11,381.72
  5. Step 5: Solve for x
    x = 11,381.72/114.45
  6. Step 6: Final answer
    x = 99.45

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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.