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Finding the Fourth Proportional to 672.48, 1,003.84 and 621.73

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Solution

The fourth proportional to 672.48, 1,003.84 and 621.73 is: 928.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.48 : 1,003.84 = 621.73 : x
  2. Step 2: Convert to fraction form
    672.48/1,003.84 = 621.73/x
  3. Step 3: Cross multiply
    672.48x = 1,003.84 × 621.73
  4. Step 4: Simplify right side
    672.48x = 624,117.44
  5. Step 5: Solve for x
    x = 624,117.44/672.48
  6. Step 6: Final answer
    x = 928.08

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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.