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Finding the Fourth Proportional to 1,000.18, 1,380.12 and 580.42

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Solution

The fourth proportional to 1,000.18, 1,380.12 and 580.42 is: 800.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.18 : 1,380.12 = 580.42 : x
  2. Step 2: Convert to fraction form
    1,000.18/1,380.12 = 580.42/x
  3. Step 3: Cross multiply
    1,000.18x = 1,380.12 × 580.42
  4. Step 4: Simplify right side
    1,000.18x = 801,049.25
  5. Step 5: Solve for x
    x = 801,049.25/1,000.18
  6. Step 6: Final answer
    x = 800.91

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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.