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Finding the Fourth Proportional to 1,000.10, 1,380.20 and 557.91

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Solution

The fourth proportional to 1,000.10, 1,380.20 and 557.91 is: 769.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.10 : 1,380.20 = 557.91 : x
  2. Step 2: Convert to fraction form
    1,000.10/1,380.20 = 557.91/x
  3. Step 3: Cross multiply
    1,000.10x = 1,380.20 × 557.91
  4. Step 4: Simplify right side
    1,000.10x = 770,032.40
  5. Step 5: Solve for x
    x = 770,032.40/1,000.10
  6. Step 6: Final answer
    x = 769.96

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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.