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Finding the Fourth Proportional to 672.20, 1,003.36 and 579.86

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Solution

The fourth proportional to 672.20, 1,003.36 and 579.86 is: 865.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.20 : 1,003.36 = 579.86 : x
  2. Step 2: Convert to fraction form
    672.20/1,003.36 = 579.86/x
  3. Step 3: Cross multiply
    672.20x = 1,003.36 × 579.86
  4. Step 4: Simplify right side
    672.20x = 581,808.33
  5. Step 5: Solve for x
    x = 581,808.33/672.20
  6. Step 6: Final answer
    x = 865.53

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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.