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Finding the Fourth Proportional to 1,331.49, 1,997.31 and 715.64

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Solution

The fourth proportional to 1,331.49, 1,997.31 and 715.64 is: 1,073.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.49 : 1,997.31 = 715.64 : x
  2. Step 2: Convert to fraction form
    1,331.49/1,997.31 = 715.64/x
  3. Step 3: Cross multiply
    1,331.49x = 1,997.31 × 715.64
  4. Step 4: Simplify right side
    1,331.49x = 1,429,343.60
  5. Step 5: Solve for x
    x = 1,429,343.60/1,331.49
  6. Step 6: Final answer
    x = 1,073.49

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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.