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Finding the Fourth Proportional to 1,247.49, 1,722.12 and 723.42

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Solution

The fourth proportional to 1,247.49, 1,722.12 and 723.42 is: 998.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.49 : 1,722.12 = 723.42 : x
  2. Step 2: Convert to fraction form
    1,247.49/1,722.12 = 723.42/x
  3. Step 3: Cross multiply
    1,247.49x = 1,722.12 × 723.42
  4. Step 4: Simplify right side
    1,247.49x = 1,245,816.05
  5. Step 5: Solve for x
    x = 1,245,816.05/1,247.49
  6. Step 6: Final answer
    x = 998.66

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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.