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Finding the Fourth Proportional to 1,279.57, 1,919.85 and 917.23

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Solution

The fourth proportional to 1,279.57, 1,919.85 and 917.23 is: 1,376.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.57 : 1,919.85 = 917.23 : x
  2. Step 2: Convert to fraction form
    1,279.57/1,919.85 = 917.23/x
  3. Step 3: Cross multiply
    1,279.57x = 1,919.85 × 917.23
  4. Step 4: Simplify right side
    1,279.57x = 1,760,944.02
  5. Step 5: Solve for x
    x = 1,760,944.02/1,279.57
  6. Step 6: Final answer
    x = 1,376.20

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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.