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Finding the Fourth Proportional to 1,314.38, 1,813.85 and 724.90

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Solution

The fourth proportional to 1,314.38, 1,813.85 and 724.90 is: 1,000.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.38 : 1,813.85 = 724.90 : x
  2. Step 2: Convert to fraction form
    1,314.38/1,813.85 = 724.90/x
  3. Step 3: Cross multiply
    1,314.38x = 1,813.85 × 724.90
  4. Step 4: Simplify right side
    1,314.38x = 1,314,856.24
  5. Step 5: Solve for x
    x = 1,314,856.24/1,314.38
  6. Step 6: Final answer
    x = 1,000.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.