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Finding the Fourth Proportional to 132.42, 182.64 and 85.74

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Solution

The fourth proportional to 132.42, 182.64 and 85.74 is: 118.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.42 : 182.64 = 85.74 : x
  2. Step 2: Convert to fraction form
    132.42/182.64 = 85.74/x
  3. Step 3: Cross multiply
    132.42x = 182.64 × 85.74
  4. Step 4: Simplify right side
    132.42x = 15,659.55
  5. Step 5: Solve for x
    x = 15,659.55/132.42
  6. Step 6: Final answer
    x = 118.26

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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.