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Finding the Fourth Proportional to 166.64, 249.80 and 85.32

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Solution

The fourth proportional to 166.64, 249.80 and 85.32 is: 127.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.64 : 249.80 = 85.32 : x
  2. Step 2: Convert to fraction form
    166.64/249.80 = 85.32/x
  3. Step 3: Cross multiply
    166.64x = 249.80 × 85.32
  4. Step 4: Simplify right side
    166.64x = 21,312.94
  5. Step 5: Solve for x
    x = 21,312.94/166.64
  6. Step 6: Final answer
    x = 127.90

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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.