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Finding the Fourth Proportional to 722.62, 1,081.20 and 678.88

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Solution

The fourth proportional to 722.62, 1,081.20 and 678.88 is: 1,015.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.62 : 1,081.20 = 678.88 : x
  2. Step 2: Convert to fraction form
    722.62/1,081.20 = 678.88/x
  3. Step 3: Cross multiply
    722.62x = 1,081.20 × 678.88
  4. Step 4: Simplify right side
    722.62x = 734,005.13
  5. Step 5: Solve for x
    x = 734,005.13/722.62
  6. Step 6: Final answer
    x = 1,015.75

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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.