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Finding the Fourth Proportional to 1,387.54, 2,082.12 and 997.12

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Solution

The fourth proportional to 1,387.54, 2,082.12 and 997.12 is: 1,496.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.54 : 2,082.12 = 997.12 : x
  2. Step 2: Convert to fraction form
    1,387.54/2,082.12 = 997.12/x
  3. Step 3: Cross multiply
    1,387.54x = 2,082.12 × 997.12
  4. Step 4: Simplify right side
    1,387.54x = 2,076,123.49
  5. Step 5: Solve for x
    x = 2,076,123.49/1,387.54
  6. Step 6: Final answer
    x = 1,496.26

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1.5x scale

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.