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Finding the Fourth Proportional to 426.68, 639.65 and 166.86

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Solution

The fourth proportional to 426.68, 639.65 and 166.86 is: 250.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.68 : 639.65 = 166.86 : x
  2. Step 2: Convert to fraction form
    426.68/639.65 = 166.86/x
  3. Step 3: Cross multiply
    426.68x = 639.65 × 166.86
  4. Step 4: Simplify right side
    426.68x = 106,731.48
  5. Step 5: Solve for x
    x = 106,731.48/426.68
  6. Step 6: Final answer
    x = 250.14

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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.