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Finding the Fourth Proportional to 1,272.44, 1,755.84 and 775.20

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Solution

The fourth proportional to 1,272.44, 1,755.84 and 775.20 is: 1,069.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.44 : 1,755.84 = 775.20 : x
  2. Step 2: Convert to fraction form
    1,272.44/1,755.84 = 775.20/x
  3. Step 3: Cross multiply
    1,272.44x = 1,755.84 × 775.20
  4. Step 4: Simplify right side
    1,272.44x = 1,361,136.66
  5. Step 5: Solve for x
    x = 1,361,136.66/1,272.44
  6. Step 6: Final answer
    x = 1,069.70

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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.