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Finding the Fourth Proportional to 1,248.88, 1,724.16 and 856.48

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Solution

The fourth proportional to 1,248.88, 1,724.16 and 856.48 is: 1,182.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.88 : 1,724.16 = 856.48 : x
  2. Step 2: Convert to fraction form
    1,248.88/1,724.16 = 856.48/x
  3. Step 3: Cross multiply
    1,248.88x = 1,724.16 × 856.48
  4. Step 4: Simplify right side
    1,248.88x = 1,476,708.56
  5. Step 5: Solve for x
    x = 1,476,708.56/1,248.88
  6. Step 6: Final answer
    x = 1,182.43

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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.