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Finding the Fourth Proportional to 462.11, 638.48 and 403.79

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Solution

The fourth proportional to 462.11, 638.48 and 403.79 is: 557.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.11 : 638.48 = 403.79 : x
  2. Step 2: Convert to fraction form
    462.11/638.48 = 403.79/x
  3. Step 3: Cross multiply
    462.11x = 638.48 × 403.79
  4. Step 4: Simplify right side
    462.11x = 257,809.82
  5. Step 5: Solve for x
    x = 257,809.82/462.11
  6. Step 6: Final answer
    x = 557.90

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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.