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Finding the Fourth Proportional to 407.72, 562.56 and 276.80

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Solution

The fourth proportional to 407.72, 562.56 and 276.80 is: 381.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.72 : 562.56 = 276.80 : x
  2. Step 2: Convert to fraction form
    407.72/562.56 = 276.80/x
  3. Step 3: Cross multiply
    407.72x = 562.56 × 276.80
  4. Step 4: Simplify right side
    407.72x = 155,716.61
  5. Step 5: Solve for x
    x = 155,716.61/407.72
  6. Step 6: Final answer
    x = 381.92

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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.