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Finding the Fourth Proportional to 1,104.75, 1,657.85 and 672.15

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Solution

The fourth proportional to 1,104.75, 1,657.85 and 672.15 is: 1,008.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,104.75 : 1,657.85 = 672.15 : x
  2. Step 2: Convert to fraction form
    1,104.75/1,657.85 = 672.15/x
  3. Step 3: Cross multiply
    1,104.75x = 1,657.85 × 672.15
  4. Step 4: Simplify right side
    1,104.75x = 1,114,320.52
  5. Step 5: Solve for x
    x = 1,114,320.52/1,104.75
  6. Step 6: Final answer
    x = 1,008.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.