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Finding the Fourth Proportional to 721.12, 1,080.04 and 591.52

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Solution

The fourth proportional to 721.12, 1,080.04 and 591.52 is: 885.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.12 : 1,080.04 = 591.52 : x
  2. Step 2: Convert to fraction form
    721.12/1,080.04 = 591.52/x
  3. Step 3: Cross multiply
    721.12x = 1,080.04 × 591.52
  4. Step 4: Simplify right side
    721.12x = 638,865.26
  5. Step 5: Solve for x
    x = 638,865.26/721.12
  6. Step 6: Final answer
    x = 885.93

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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.