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Finding the Fourth Proportional to 1,279.95, 1,917.96 and 758.91

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Solution

The fourth proportional to 1,279.95, 1,917.96 and 758.91 is: 1,137.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.95 : 1,917.96 = 758.91 : x
  2. Step 2: Convert to fraction form
    1,279.95/1,917.96 = 758.91/x
  3. Step 3: Cross multiply
    1,279.95x = 1,917.96 × 758.91
  4. Step 4: Simplify right side
    1,279.95x = 1,455,559.02
  5. Step 5: Solve for x
    x = 1,455,559.02/1,279.95
  6. Step 6: Final answer
    x = 1,137.20

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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.