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Finding the Fourth Proportional to 1,000.59, 1,380.79 and 558.49

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Solution

The fourth proportional to 1,000.59, 1,380.79 and 558.49 is: 770.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.59 : 1,380.79 = 558.49 : x
  2. Step 2: Convert to fraction form
    1,000.59/1,380.79 = 558.49/x
  3. Step 3: Cross multiply
    1,000.59x = 1,380.79 × 558.49
  4. Step 4: Simplify right side
    1,000.59x = 771,157.41
  5. Step 5: Solve for x
    x = 771,157.41/1,000.59
  6. Step 6: Final answer
    x = 770.70

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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.