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Finding the Fourth Proportional to 1,278.13, 1,763.86 and 780.99

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Solution

The fourth proportional to 1,278.13, 1,763.86 and 780.99 is: 1,077.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.13 : 1,763.86 = 780.99 : x
  2. Step 2: Convert to fraction form
    1,278.13/1,763.86 = 780.99/x
  3. Step 3: Cross multiply
    1,278.13x = 1,763.86 × 780.99
  4. Step 4: Simplify right side
    1,278.13x = 1,377,555.07
  5. Step 5: Solve for x
    x = 1,377,555.07/1,278.13
  6. Step 6: Final answer
    x = 1,077.79

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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.