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Finding the Fourth Proportional to 1,380.16, 2,069.20 and 650.24

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Solution

The fourth proportional to 1,380.16, 2,069.20 and 650.24 is: 974.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.16 : 2,069.20 = 650.24 : x
  2. Step 2: Convert to fraction form
    1,380.16/2,069.20 = 650.24/x
  3. Step 3: Cross multiply
    1,380.16x = 2,069.20 × 650.24
  4. Step 4: Simplify right side
    1,380.16x = 1,345,476.61
  5. Step 5: Solve for x
    x = 1,345,476.61/1,380.16
  6. Step 6: Final answer
    x = 974.87

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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.