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Finding the Fourth Proportional to 462.70, 638.76 and 276.31

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Solution

The fourth proportional to 462.70, 638.76 and 276.31 is: 381.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.70 : 638.76 = 276.31 : x
  2. Step 2: Convert to fraction form
    462.70/638.76 = 276.31/x
  3. Step 3: Cross multiply
    462.70x = 638.76 × 276.31
  4. Step 4: Simplify right side
    462.70x = 176,495.78
  5. Step 5: Solve for x
    x = 176,495.78/462.70
  6. Step 6: Final answer
    x = 381.45

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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.