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Finding the Fourth Proportional to 1,279.66, 1,763.87 and 955.76

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Solution

The fourth proportional to 1,279.66, 1,763.87 and 955.76 is: 1,317.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.66 : 1,763.87 = 955.76 : x
  2. Step 2: Convert to fraction form
    1,279.66/1,763.87 = 955.76/x
  3. Step 3: Cross multiply
    1,279.66x = 1,763.87 × 955.76
  4. Step 4: Simplify right side
    1,279.66x = 1,685,829.96
  5. Step 5: Solve for x
    x = 1,685,829.96/1,279.66
  6. Step 6: Final answer
    x = 1,317.41

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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.