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Finding the Fourth Proportional to 1,189.15, 1,641.68 and 717.13

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Solution

The fourth proportional to 1,189.15, 1,641.68 and 717.13 is: 990.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.15 : 1,641.68 = 717.13 : x
  2. Step 2: Convert to fraction form
    1,189.15/1,641.68 = 717.13/x
  3. Step 3: Cross multiply
    1,189.15x = 1,641.68 × 717.13
  4. Step 4: Simplify right side
    1,189.15x = 1,177,296.44
  5. Step 5: Solve for x
    x = 1,177,296.44/1,189.15
  6. Step 6: Final answer
    x = 990.03

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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.