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Finding the Fourth Proportional to 425.64, 638.45 and 169.14

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Solution

The fourth proportional to 425.64, 638.45 and 169.14 is: 253.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.64 : 638.45 = 169.14 : x
  2. Step 2: Convert to fraction form
    425.64/638.45 = 169.14/x
  3. Step 3: Cross multiply
    425.64x = 638.45 × 169.14
  4. Step 4: Simplify right side
    425.64x = 107,984.24
  5. Step 5: Solve for x
    x = 107,984.24/425.64
  6. Step 6: Final answer
    x = 253.70

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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.