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Finding the Fourth Proportional to 1,000.31, 1,380.42 and 558.20

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Solution

The fourth proportional to 1,000.31, 1,380.42 and 558.20 is: 770.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.31 : 1,380.42 = 558.20 : x
  2. Step 2: Convert to fraction form
    1,000.31/1,380.42 = 558.20/x
  3. Step 3: Cross multiply
    1,000.31x = 1,380.42 × 558.20
  4. Step 4: Simplify right side
    1,000.31x = 770,553.90
  5. Step 5: Solve for x
    x = 770,553.90/1,000.31
  6. Step 6: Final answer
    x = 770.32

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Double scale
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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.