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Finding the Fourth Proportional to 1,387.60, 2,082.24 and 803.75

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Solution

The fourth proportional to 1,387.60, 2,082.24 and 803.75 is: 1,206.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.60 : 2,082.24 = 803.75 : x
  2. Step 2: Convert to fraction form
    1,387.60/2,082.24 = 803.75/x
  3. Step 3: Cross multiply
    1,387.60x = 2,082.24 × 803.75
  4. Step 4: Simplify right side
    1,387.60x = 1,673,589.99
  5. Step 5: Solve for x
    x = 1,673,589.99/1,387.60
  6. Step 6: Final answer
    x = 1,206.11

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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.