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Finding the Fourth Proportional to 425.36, 637.72 and 136.72

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Solution

The fourth proportional to 425.36, 637.72 and 136.72 is: 204.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.36 : 637.72 = 136.72 : x
  2. Step 2: Convert to fraction form
    425.36/637.72 = 136.72/x
  3. Step 3: Cross multiply
    425.36x = 637.72 × 136.72
  4. Step 4: Simplify right side
    425.36x = 87,189.08
  5. Step 5: Solve for x
    x = 87,189.08/425.36
  6. Step 6: Final answer
    x = 204.98

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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.