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Finding the Fourth Proportional to 855.90, 1,281.15 and 672.30

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Solution

The fourth proportional to 855.90, 1,281.15 and 672.30 is: 1,006.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.90 : 1,281.15 = 672.30 : x
  2. Step 2: Convert to fraction form
    855.90/1,281.15 = 672.30/x
  3. Step 3: Cross multiply
    855.90x = 1,281.15 × 672.30
  4. Step 4: Simplify right side
    855.90x = 861,317.15
  5. Step 5: Solve for x
    x = 861,317.15/855.90
  6. Step 6: Final answer
    x = 1,006.33

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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.