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Finding the Fourth Proportional to 721.15, 1,081.79 and 528.55

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Solution

The fourth proportional to 721.15, 1,081.79 and 528.55 is: 792.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.15 : 1,081.79 = 528.55 : x
  2. Step 2: Convert to fraction form
    721.15/1,081.79 = 528.55/x
  3. Step 3: Cross multiply
    721.15x = 1,081.79 × 528.55
  4. Step 4: Simplify right side
    721.15x = 571,782.01
  5. Step 5: Solve for x
    x = 571,782.01/721.15
  6. Step 6: Final answer
    x = 792.87

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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.