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Finding the Fourth Proportional to 1,279.90, 1,919.87 and 887.76

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Solution

The fourth proportional to 1,279.90, 1,919.87 and 887.76 is: 1,331.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.90 : 1,919.87 = 887.76 : x
  2. Step 2: Convert to fraction form
    1,279.90/1,919.87 = 887.76/x
  3. Step 3: Cross multiply
    1,279.90x = 1,919.87 × 887.76
  4. Step 4: Simplify right side
    1,279.90x = 1,704,382.68
  5. Step 5: Solve for x
    x = 1,704,382.68/1,279.90
  6. Step 6: Final answer
    x = 1,331.65

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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.