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Finding the Fourth Proportional to 1,279.02, 1,765.54 and 860.57

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Solution

The fourth proportional to 1,279.02, 1,765.54 and 860.57 is: 1,187.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.02 : 1,765.54 = 860.57 : x
  2. Step 2: Convert to fraction form
    1,279.02/1,765.54 = 860.57/x
  3. Step 3: Cross multiply
    1,279.02x = 1,765.54 × 860.57
  4. Step 4: Simplify right side
    1,279.02x = 1,519,365.27
  5. Step 5: Solve for x
    x = 1,519,365.27/1,279.02
  6. Step 6: Final answer
    x = 1,187.91

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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.