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Finding the Fourth Proportional to 1,248.31, 1,722.77 and 724.51

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Solution

The fourth proportional to 1,248.31, 1,722.77 and 724.51 is: 999.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.31 : 1,722.77 = 724.51 : x
  2. Step 2: Convert to fraction form
    1,248.31/1,722.77 = 724.51/x
  3. Step 3: Cross multiply
    1,248.31x = 1,722.77 × 724.51
  4. Step 4: Simplify right side
    1,248.31x = 1,248,164.09
  5. Step 5: Solve for x
    x = 1,248,164.09/1,248.31
  6. Step 6: Final answer
    x = 999.88

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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.