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Finding the Fourth Proportional to 1,000.88, 1,381.20 and 558.80

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Solution

The fourth proportional to 1,000.88, 1,381.20 and 558.80 is: 771.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.88 : 1,381.20 = 558.80 : x
  2. Step 2: Convert to fraction form
    1,000.88/1,381.20 = 558.80/x
  3. Step 3: Cross multiply
    1,000.88x = 1,381.20 × 558.80
  4. Step 4: Simplify right side
    1,000.88x = 771,814.56
  5. Step 5: Solve for x
    x = 771,814.56/1,000.88
  6. Step 6: Final answer
    x = 771.14

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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.