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Finding the Fourth Proportional to 425.64, 638.40 and 137.04

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Solution

The fourth proportional to 425.64, 638.40 and 137.04 is: 205.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.64 : 638.40 = 137.04 : x
  2. Step 2: Convert to fraction form
    425.64/638.40 = 137.04/x
  3. Step 3: Cross multiply
    425.64x = 638.40 × 137.04
  4. Step 4: Simplify right side
    425.64x = 87,486.34
  5. Step 5: Solve for x
    x = 87,486.34/425.64
  6. Step 6: Final answer
    x = 205.54

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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.