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Finding the Fourth Proportional to 1,247.08, 1,720.95 and 723.11

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Solution

The fourth proportional to 1,247.08, 1,720.95 and 723.11 is: 997.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.08 : 1,720.95 = 723.11 : x
  2. Step 2: Convert to fraction form
    1,247.08/1,720.95 = 723.11/x
  3. Step 3: Cross multiply
    1,247.08x = 1,720.95 × 723.11
  4. Step 4: Simplify right side
    1,247.08x = 1,244,436.15
  5. Step 5: Solve for x
    x = 1,244,436.15/1,247.08
  6. Step 6: Final answer
    x = 997.88

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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.