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Finding the Fourth Proportional to 855.13, 1,281.19 and 765.49

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Solution

The fourth proportional to 855.13, 1,281.19 and 765.49 is: 1,146.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.13 : 1,281.19 = 765.49 : x
  2. Step 2: Convert to fraction form
    855.13/1,281.19 = 765.49/x
  3. Step 3: Cross multiply
    855.13x = 1,281.19 × 765.49
  4. Step 4: Simplify right side
    855.13x = 980,738.13
  5. Step 5: Solve for x
    x = 980,738.13/855.13
  6. Step 6: Final answer
    x = 1,146.89

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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.