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Finding the Fourth Proportional to 462.40, 638.40 and 404.80

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Solution

The fourth proportional to 462.40, 638.40 and 404.80 is: 558.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.40 : 638.40 = 404.80 : x
  2. Step 2: Convert to fraction form
    462.40/638.40 = 404.80/x
  3. Step 3: Cross multiply
    462.40x = 638.40 × 404.80
  4. Step 4: Simplify right side
    462.40x = 258,424.32
  5. Step 5: Solve for x
    x = 258,424.32/462.40
  6. Step 6: Final answer
    x = 558.88

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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.