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Finding the Fourth Proportional to 1,271.98, 1,755.49 and 712.66

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Solution

The fourth proportional to 1,271.98, 1,755.49 and 712.66 is: 983.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.98 : 1,755.49 = 712.66 : x
  2. Step 2: Convert to fraction form
    1,271.98/1,755.49 = 712.66/x
  3. Step 3: Cross multiply
    1,271.98x = 1,755.49 × 712.66
  4. Step 4: Simplify right side
    1,271.98x = 1,251,058.73
  5. Step 5: Solve for x
    x = 1,251,058.73/1,271.98
  6. Step 6: Final answer
    x = 983.56

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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.