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Finding the Fourth Proportional to 1,331.55, 1,997.33 and 407.03

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Solution

The fourth proportional to 1,331.55, 1,997.33 and 407.03 is: 610.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.55 : 1,997.33 = 407.03 : x
  2. Step 2: Convert to fraction form
    1,331.55/1,997.33 = 407.03/x
  3. Step 3: Cross multiply
    1,331.55x = 1,997.33 × 407.03
  4. Step 4: Simplify right side
    1,331.55x = 812,961.21
  5. Step 5: Solve for x
    x = 812,961.21/1,331.55
  6. Step 6: Final answer
    x = 610.54

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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.