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Finding the Fourth Proportional to 1,277.82, 1,763.26 and 780.58

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Solution

The fourth proportional to 1,277.82, 1,763.26 and 780.58 is: 1,077.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.82 : 1,763.26 = 780.58 : x
  2. Step 2: Convert to fraction form
    1,277.82/1,763.26 = 780.58/x
  3. Step 3: Cross multiply
    1,277.82x = 1,763.26 × 780.58
  4. Step 4: Simplify right side
    1,277.82x = 1,376,365.49
  5. Step 5: Solve for x
    x = 1,376,365.49/1,277.82
  6. Step 6: Final answer
    x = 1,077.12

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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.