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Finding the Fourth Proportional to 1,272.88, 1,754.20 and 992.68

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Solution

The fourth proportional to 1,272.88, 1,754.20 and 992.68 is: 1,368.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.88 : 1,754.20 = 992.68 : x
  2. Step 2: Convert to fraction form
    1,272.88/1,754.20 = 992.68/x
  3. Step 3: Cross multiply
    1,272.88x = 1,754.20 × 992.68
  4. Step 4: Simplify right side
    1,272.88x = 1,741,351.73
  5. Step 5: Solve for x
    x = 1,741,351.73/1,272.88
  6. Step 6: Final answer
    x = 1,368.04

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1.5x scale

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.