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Finding the Fourth Proportional to 1,000.15, 1,380.11 and 558.09

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Solution

The fourth proportional to 1,000.15, 1,380.11 and 558.09 is: 770.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.15 : 1,380.11 = 558.09 : x
  2. Step 2: Convert to fraction form
    1,000.15/1,380.11 = 558.09/x
  3. Step 3: Cross multiply
    1,000.15x = 1,380.11 × 558.09
  4. Step 4: Simplify right side
    1,000.15x = 770,222.80
  5. Step 5: Solve for x
    x = 770,222.80/1,000.15
  6. Step 6: Final answer
    x = 770.11

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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.