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Finding the Fourth Proportional to 1,191.97, 1,644.92 and 668.10

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Solution

The fourth proportional to 1,191.97, 1,644.92 and 668.10 is: 921.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.97 : 1,644.92 = 668.10 : x
  2. Step 2: Convert to fraction form
    1,191.97/1,644.92 = 668.10/x
  3. Step 3: Cross multiply
    1,191.97x = 1,644.92 × 668.10
  4. Step 4: Simplify right side
    1,191.97x = 1,098,971.05
  5. Step 5: Solve for x
    x = 1,098,971.05/1,191.97
  6. Step 6: Final answer
    x = 921.98

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1.5x scale

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.