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Finding the Fourth Proportional to 462.38, 638.55 and 345.74

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Solution

The fourth proportional to 462.38, 638.55 and 345.74 is: 477.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.38 : 638.55 = 345.74 : x
  2. Step 2: Convert to fraction form
    462.38/638.55 = 345.74/x
  3. Step 3: Cross multiply
    462.38x = 638.55 × 345.74
  4. Step 4: Simplify right side
    462.38x = 220,769.08
  5. Step 5: Solve for x
    x = 220,769.08/462.38
  6. Step 6: Final answer
    x = 477.47

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.