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Finding the Fourth Proportional to 166.80, 249 and 142.32

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Solution

The fourth proportional to 166.80, 249 and 142.32 is: 212.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.80 : 249 = 142.32 : x
  2. Step 2: Convert to fraction form
    166.80/249 = 142.32/x
  3. Step 3: Cross multiply
    166.80x = 249 × 142.32
  4. Step 4: Simplify right side
    166.80x = 35,437.68
  5. Step 5: Solve for x
    x = 35,437.68/166.80
  6. Step 6: Final answer
    x = 212.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.