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Finding the Fourth Proportional to 1,272.44, 1,755.90 and 712.91

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Solution

The fourth proportional to 1,272.44, 1,755.90 and 712.91 is: 983.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.44 : 1,755.90 = 712.91 : x
  2. Step 2: Convert to fraction form
    1,272.44/1,755.90 = 712.91/x
  3. Step 3: Cross multiply
    1,272.44x = 1,755.90 × 712.91
  4. Step 4: Simplify right side
    1,272.44x = 1,251,798.67
  5. Step 5: Solve for x
    x = 1,251,798.67/1,272.44
  6. Step 6: Final answer
    x = 983.78

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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.