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Finding the Fourth Proportional to 425.85, 638.66 and 165.90

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Solution

The fourth proportional to 425.85, 638.66 and 165.90 is: 248.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.85 : 638.66 = 165.90 : x
  2. Step 2: Convert to fraction form
    425.85/638.66 = 165.90/x
  3. Step 3: Cross multiply
    425.85x = 638.66 × 165.90
  4. Step 4: Simplify right side
    425.85x = 105,952.86
  5. Step 5: Solve for x
    x = 105,952.86/425.85
  6. Step 6: Final answer
    x = 248.80

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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.