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Finding the Fourth Proportional to 722.18, 1,081.92 and 356.87

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Solution

The fourth proportional to 722.18, 1,081.92 and 356.87 is: 534.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.18 : 1,081.92 = 356.87 : x
  2. Step 2: Convert to fraction form
    722.18/1,081.92 = 356.87/x
  3. Step 3: Cross multiply
    722.18x = 1,081.92 × 356.87
  4. Step 4: Simplify right side
    722.18x = 386,104.79
  5. Step 5: Solve for x
    x = 386,104.79/722.18
  6. Step 6: Final answer
    x = 534.64

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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.