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Finding the Fourth Proportional to 1,248.81, 1,723.34 and 689.33

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Solution

The fourth proportional to 1,248.81, 1,723.34 and 689.33 is: 951.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.81 : 1,723.34 = 689.33 : x
  2. Step 2: Convert to fraction form
    1,248.81/1,723.34 = 689.33/x
  3. Step 3: Cross multiply
    1,248.81x = 1,723.34 × 689.33
  4. Step 4: Simplify right side
    1,248.81x = 1,187,937.90
  5. Step 5: Solve for x
    x = 1,187,937.90/1,248.81
  6. Step 6: Final answer
    x = 951.26

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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.