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Finding the Fourth Proportional to 1,000.40, 1,380.56 and 558.40

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Solution

The fourth proportional to 1,000.40, 1,380.56 and 558.40 is: 770.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.40 : 1,380.56 = 558.40 : x
  2. Step 2: Convert to fraction form
    1,000.40/1,380.56 = 558.40/x
  3. Step 3: Cross multiply
    1,000.40x = 1,380.56 × 558.40
  4. Step 4: Simplify right side
    1,000.40x = 770,904.70
  5. Step 5: Solve for x
    x = 770,904.70/1,000.40
  6. Step 6: Final answer
    x = 770.60

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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.