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Finding the Fourth Proportional to 718.20, 1,079.60 and 667.49

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Solution

The fourth proportional to 718.20, 1,079.60 and 667.49 is: 1,003.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.20 : 1,079.60 = 667.49 : x
  2. Step 2: Convert to fraction form
    718.20/1,079.60 = 667.49/x
  3. Step 3: Cross multiply
    718.20x = 1,079.60 × 667.49
  4. Step 4: Simplify right side
    718.20x = 720,613.47
  5. Step 5: Solve for x
    x = 720,613.47/718.20
  6. Step 6: Final answer
    x = 1,003.36

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1.5x scale

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.