Home / 1,247.20-1,720.88-749.66

Finding the Fourth Proportional to 1,247.20, 1,720.88 and 749.66

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Solution

The fourth proportional to 1,247.20, 1,720.88 and 749.66 is: 1,034.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.20 : 1,720.88 = 749.66 : x
  2. Step 2: Convert to fraction form
    1,247.20/1,720.88 = 749.66/x
  3. Step 3: Cross multiply
    1,247.20x = 1,720.88 × 749.66
  4. Step 4: Simplify right side
    1,247.20x = 1,290,065.36
  5. Step 5: Solve for x
    x = 1,290,065.36/1,247.20
  6. Step 6: Final answer
    x = 1,034.37

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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.