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Finding the Fourth Proportional to 1,245.42, 1,718.82 and 773.28

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Solution

The fourth proportional to 1,245.42, 1,718.82 and 773.28 is: 1,067.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.42 : 1,718.82 = 773.28 : x
  2. Step 2: Convert to fraction form
    1,245.42/1,718.82 = 773.28/x
  3. Step 3: Cross multiply
    1,245.42x = 1,718.82 × 773.28
  4. Step 4: Simplify right side
    1,245.42x = 1,329,129.13
  5. Step 5: Solve for x
    x = 1,329,129.13/1,245.42
  6. Step 6: Final answer
    x = 1,067.21

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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.