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Finding the Fourth Proportional to 1,331.40, 1,996.77 and 872.13

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Solution

The fourth proportional to 1,331.40, 1,996.77 and 872.13 is: 1,307.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.40 : 1,996.77 = 872.13 : x
  2. Step 2: Convert to fraction form
    1,331.40/1,996.77 = 872.13/x
  3. Step 3: Cross multiply
    1,331.40x = 1,996.77 × 872.13
  4. Step 4: Simplify right side
    1,331.40x = 1,741,443.02
  5. Step 5: Solve for x
    x = 1,741,443.02/1,331.40
  6. Step 6: Final answer
    x = 1,307.98

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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.