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Finding the Fourth Proportional to 1,279.15, 1,765.25 and 712

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Solution

The fourth proportional to 1,279.15, 1,765.25 and 712 is: 982.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.15 : 1,765.25 = 712 : x
  2. Step 2: Convert to fraction form
    1,279.15/1,765.25 = 712/x
  3. Step 3: Cross multiply
    1,279.15x = 1,765.25 × 712
  4. Step 4: Simplify right side
    1,279.15x = 1,256,858
  5. Step 5: Solve for x
    x = 1,256,858/1,279.15
  6. Step 6: Final answer
    x = 982.57

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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.