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Finding the Fourth Proportional to 1,278.16, 1,919.16 and 759.04

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Solution

The fourth proportional to 1,278.16, 1,919.16 and 759.04 is: 1,139.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.16 : 1,919.16 = 759.04 : x
  2. Step 2: Convert to fraction form
    1,278.16/1,919.16 = 759.04/x
  3. Step 3: Cross multiply
    1,278.16x = 1,919.16 × 759.04
  4. Step 4: Simplify right side
    1,278.16x = 1,456,719.21
  5. Step 5: Solve for x
    x = 1,456,719.21/1,278.16
  6. Step 6: Final answer
    x = 1,139.70

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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.