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Finding the Fourth Proportional to 1,189.47, 1,641.68 and 717.75

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Solution

The fourth proportional to 1,189.47, 1,641.68 and 717.75 is: 990.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.47 : 1,641.68 = 717.75 : x
  2. Step 2: Convert to fraction form
    1,189.47/1,641.68 = 717.75/x
  3. Step 3: Cross multiply
    1,189.47x = 1,641.68 × 717.75
  4. Step 4: Simplify right side
    1,189.47x = 1,178,312.23
  5. Step 5: Solve for x
    x = 1,178,312.23/1,189.47
  6. Step 6: Final answer
    x = 990.62

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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.