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Finding the Fourth Proportional to 909.27, 1,255.86 and 672.89

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Solution

The fourth proportional to 909.27, 1,255.86 and 672.89 is: 929.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.27 : 1,255.86 = 672.89 : x
  2. Step 2: Convert to fraction form
    909.27/1,255.86 = 672.89/x
  3. Step 3: Cross multiply
    909.27x = 1,255.86 × 672.89
  4. Step 4: Simplify right side
    909.27x = 845,049.36
  5. Step 5: Solve for x
    x = 845,049.36/909.27
  6. Step 6: Final answer
    x = 929.37

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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.