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Finding the Fourth Proportional to 132.91, 183.42 and 74.70

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Solution

The fourth proportional to 132.91, 183.42 and 74.70 is: 103.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.91 : 183.42 = 74.70 : x
  2. Step 2: Convert to fraction form
    132.91/183.42 = 74.70/x
  3. Step 3: Cross multiply
    132.91x = 183.42 × 74.70
  4. Step 4: Simplify right side
    132.91x = 13,701.47
  5. Step 5: Solve for x
    x = 13,701.47/132.91
  6. Step 6: Final answer
    x = 103.09

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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.