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Finding the Fourth Proportional to 718.20, 1,081.49 and 696.67

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Solution

The fourth proportional to 718.20, 1,081.49 and 696.67 is: 1,049.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.20 : 1,081.49 = 696.67 : x
  2. Step 2: Convert to fraction form
    718.20/1,081.49 = 696.67/x
  3. Step 3: Cross multiply
    718.20x = 1,081.49 × 696.67
  4. Step 4: Simplify right side
    718.20x = 753,435.45
  5. Step 5: Solve for x
    x = 753,435.45/718.20
  6. Step 6: Final answer
    x = 1,049.06

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.