Home / 1,189.20-1,641.18-717.18

Finding the Fourth Proportional to 1,189.20, 1,641.18 and 717.18

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Solution

The fourth proportional to 1,189.20, 1,641.18 and 717.18 is: 989.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.20 : 1,641.18 = 717.18 : x
  2. Step 2: Convert to fraction form
    1,189.20/1,641.18 = 717.18/x
  3. Step 3: Cross multiply
    1,189.20x = 1,641.18 × 717.18
  4. Step 4: Simplify right side
    1,189.20x = 1,177,021.47
  5. Step 5: Solve for x
    x = 1,177,021.47/1,189.20
  6. Step 6: Final answer
    x = 989.76

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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.