Home / 1,247.16-1,720.80-723.18

Finding the Fourth Proportional to 1,247.16, 1,720.80 and 723.18

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Solution

The fourth proportional to 1,247.16, 1,720.80 and 723.18 is: 997.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.16 : 1,720.80 = 723.18 : x
  2. Step 2: Convert to fraction form
    1,247.16/1,720.80 = 723.18/x
  3. Step 3: Cross multiply
    1,247.16x = 1,720.80 × 723.18
  4. Step 4: Simplify right side
    1,247.16x = 1,244,448.14
  5. Step 5: Solve for x
    x = 1,244,448.14/1,247.16
  6. Step 6: Final answer
    x = 997.83

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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.