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Finding the Fourth Proportional to 803.97, 1,109.61 and 672.93

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Solution

The fourth proportional to 803.97, 1,109.61 and 672.93 is: 928.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.97 : 1,109.61 = 672.93 : x
  2. Step 2: Convert to fraction form
    803.97/1,109.61 = 672.93/x
  3. Step 3: Cross multiply
    803.97x = 1,109.61 × 672.93
  4. Step 4: Simplify right side
    803.97x = 746,689.86
  5. Step 5: Solve for x
    x = 746,689.86/803.97
  6. Step 6: Final answer
    x = 928.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.