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Finding the Fourth Proportional to 679.48, 1,013.08 and 672.76

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Solution

The fourth proportional to 679.48, 1,013.08 and 672.76 is: 1,003.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.48 : 1,013.08 = 672.76 : x
  2. Step 2: Convert to fraction form
    679.48/1,013.08 = 672.76/x
  3. Step 3: Cross multiply
    679.48x = 1,013.08 × 672.76
  4. Step 4: Simplify right side
    679.48x = 681,559.70
  5. Step 5: Solve for x
    x = 681,559.70/679.48
  6. Step 6: Final answer
    x = 1,003.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.