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Finding the Fourth Proportional to 729.20, 1,094.72 and 725.87

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Solution

The fourth proportional to 729.20, 1,094.72 and 725.87 is: 1,089.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.20 : 1,094.72 = 725.87 : x
  2. Step 2: Convert to fraction form
    729.20/1,094.72 = 725.87/x
  3. Step 3: Cross multiply
    729.20x = 1,094.72 × 725.87
  4. Step 4: Simplify right side
    729.20x = 794,624.41
  5. Step 5: Solve for x
    x = 794,624.41/729.20
  6. Step 6: Final answer
    x = 1,089.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.