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Finding the Fourth Proportional to 425.72, 638.08 and 194.40

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Solution

The fourth proportional to 425.72, 638.08 and 194.40 is: 291.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.72 : 638.08 = 194.40 : x
  2. Step 2: Convert to fraction form
    425.72/638.08 = 194.40/x
  3. Step 3: Cross multiply
    425.72x = 638.08 × 194.40
  4. Step 4: Simplify right side
    425.72x = 124,042.27
  5. Step 5: Solve for x
    x = 124,042.27/425.72
  6. Step 6: Final answer
    x = 291.37

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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.