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Finding the Fourth Proportional to 1,191.72, 1,644.49 and 667.65

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Solution

The fourth proportional to 1,191.72, 1,644.49 and 667.65 is: 921.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.72 : 1,644.49 = 667.65 : x
  2. Step 2: Convert to fraction form
    1,191.72/1,644.49 = 667.65/x
  3. Step 3: Cross multiply
    1,191.72x = 1,644.49 × 667.65
  4. Step 4: Simplify right side
    1,191.72x = 1,097,943.75
  5. Step 5: Solve for x
    x = 1,097,943.75/1,191.72
  6. Step 6: Final answer
    x = 921.31

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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.