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Finding the Fourth Proportional to 1,000.12, 1,380.11 and 558.06

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Solution

The fourth proportional to 1,000.12, 1,380.11 and 558.06 is: 770.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.12 : 1,380.11 = 558.06 : x
  2. Step 2: Convert to fraction form
    1,000.12/1,380.11 = 558.06/x
  3. Step 3: Cross multiply
    1,000.12x = 1,380.11 × 558.06
  4. Step 4: Simplify right side
    1,000.12x = 770,184.19
  5. Step 5: Solve for x
    x = 770,184.19/1,000.12
  6. Step 6: Final answer
    x = 770.09

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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.