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Finding the Fourth Proportional to 1,331.82, 1,997.79 and 407.31

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Solution

The fourth proportional to 1,331.82, 1,997.79 and 407.31 is: 610.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.82 : 1,997.79 = 407.31 : x
  2. Step 2: Convert to fraction form
    1,331.82/1,997.79 = 407.31/x
  3. Step 3: Cross multiply
    1,331.82x = 1,997.79 × 407.31
  4. Step 4: Simplify right side
    1,331.82x = 813,719.84
  5. Step 5: Solve for x
    x = 813,719.84/1,331.82
  6. Step 6: Final answer
    x = 610.98

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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.