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Finding the Fourth Proportional to 425.79, 638.55 and 165.80

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Solution

The fourth proportional to 425.79, 638.55 and 165.80 is: 248.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.79 : 638.55 = 165.80 : x
  2. Step 2: Convert to fraction form
    425.79/638.55 = 165.80/x
  3. Step 3: Cross multiply
    425.79x = 638.55 × 165.80
  4. Step 4: Simplify right side
    425.79x = 105,873.19
  5. Step 5: Solve for x
    x = 105,873.19/425.79
  6. Step 6: Final answer
    x = 248.65

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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.