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Finding the Fourth Proportional to 1,331.44, 1,997.36 and 407.13

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Solution

The fourth proportional to 1,331.44, 1,997.36 and 407.13 is: 610.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.44 : 1,997.36 = 407.13 : x
  2. Step 2: Convert to fraction form
    1,331.44/1,997.36 = 407.13/x
  3. Step 3: Cross multiply
    1,331.44x = 1,997.36 × 407.13
  4. Step 4: Simplify right side
    1,331.44x = 813,177.18
  5. Step 5: Solve for x
    x = 813,177.18/1,331.44
  6. Step 6: Final answer
    x = 610.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.