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Finding the Fourth Proportional to 803.46, 1,108.91 and 672.42

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Solution

The fourth proportional to 803.46, 1,108.91 and 672.42 is: 928.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.46 : 1,108.91 = 672.42 : x
  2. Step 2: Convert to fraction form
    803.46/1,108.91 = 672.42/x
  3. Step 3: Cross multiply
    803.46x = 1,108.91 × 672.42
  4. Step 4: Simplify right side
    803.46x = 745,653.26
  5. Step 5: Solve for x
    x = 745,653.26/803.46
  6. Step 6: Final answer
    x = 928.05

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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.