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Finding the Fourth Proportional to 1,331.47, 1,997.28 and 407.17

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Solution

The fourth proportional to 1,331.47, 1,997.28 and 407.17 is: 610.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.47 : 1,997.28 = 407.17 : x
  2. Step 2: Convert to fraction form
    1,331.47/1,997.28 = 407.17/x
  3. Step 3: Cross multiply
    1,331.47x = 1,997.28 × 407.17
  4. Step 4: Simplify right side
    1,331.47x = 813,232.50
  5. Step 5: Solve for x
    x = 813,232.50/1,331.47
  6. Step 6: Final answer
    x = 610.78

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Double scale
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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.