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Finding the Fourth Proportional to 1,277.56, 1,763.72 and 780.28

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Solution

The fourth proportional to 1,277.56, 1,763.72 and 780.28 is: 1,077.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.56 : 1,763.72 = 780.28 : x
  2. Step 2: Convert to fraction form
    1,277.56/1,763.72 = 780.28/x
  3. Step 3: Cross multiply
    1,277.56x = 1,763.72 × 780.28
  4. Step 4: Simplify right side
    1,277.56x = 1,376,195.44
  5. Step 5: Solve for x
    x = 1,376,195.44/1,277.56
  6. Step 6: Final answer
    x = 1,077.21

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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.