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Finding the Fourth Proportional to 1,272.42, 1,755.82 and 712.88

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Solution

The fourth proportional to 1,272.42, 1,755.82 and 712.88 is: 983.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.42 : 1,755.82 = 712.88 : x
  2. Step 2: Convert to fraction form
    1,272.42/1,755.82 = 712.88/x
  3. Step 3: Cross multiply
    1,272.42x = 1,755.82 × 712.88
  4. Step 4: Simplify right side
    1,272.42x = 1,251,688.96
  5. Step 5: Solve for x
    x = 1,251,688.96/1,272.42
  6. Step 6: Final answer
    x = 983.71

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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.