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Finding the Fourth Proportional to 721.46, 1,081.15 and 356.50

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Solution

The fourth proportional to 721.46, 1,081.15 and 356.50 is: 534.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.46 : 1,081.15 = 356.50 : x
  2. Step 2: Convert to fraction form
    721.46/1,081.15 = 356.50/x
  3. Step 3: Cross multiply
    721.46x = 1,081.15 × 356.50
  4. Step 4: Simplify right side
    721.46x = 385,430.44
  5. Step 5: Solve for x
    x = 385,430.44/721.46
  6. Step 6: Final answer
    x = 534.24

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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.