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Finding the Fourth Proportional to 1,272.12, 1,755.56 and 712.60

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Solution

The fourth proportional to 1,272.12, 1,755.56 and 712.60 is: 983.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.12 : 1,755.56 = 712.60 : x
  2. Step 2: Convert to fraction form
    1,272.12/1,755.56 = 712.60/x
  3. Step 3: Cross multiply
    1,272.12x = 1,755.56 × 712.60
  4. Step 4: Simplify right side
    1,272.12x = 1,251,012.06
  5. Step 5: Solve for x
    x = 1,251,012.06/1,272.12
  6. Step 6: Final answer
    x = 983.41

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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.