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Finding the Fourth Proportional to 725.80, 1,087.46 and 478.85

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Solution

The fourth proportional to 725.80, 1,087.46 and 478.85 is: 717.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.80 : 1,087.46 = 478.85 : x
  2. Step 2: Convert to fraction form
    725.80/1,087.46 = 478.85/x
  3. Step 3: Cross multiply
    725.80x = 1,087.46 × 478.85
  4. Step 4: Simplify right side
    725.80x = 520,730.22
  5. Step 5: Solve for x
    x = 520,730.22/725.80
  6. Step 6: Final answer
    x = 717.46

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1.5x scale

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.