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Finding the Fourth Proportional to 718.70, 1,079.26 and 640.73

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Solution

The fourth proportional to 718.70, 1,079.26 and 640.73 is: 962.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.70 : 1,079.26 = 640.73 : x
  2. Step 2: Convert to fraction form
    718.70/1,079.26 = 640.73/x
  3. Step 3: Cross multiply
    718.70x = 1,079.26 × 640.73
  4. Step 4: Simplify right side
    718.70x = 691,515.36
  5. Step 5: Solve for x
    x = 691,515.36/718.70
  6. Step 6: Final answer
    x = 962.18

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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.