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Finding the Fourth Proportional to 1,191.65, 1,644.45 and 667.69

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Solution

The fourth proportional to 1,191.65, 1,644.45 and 667.69 is: 921.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.65 : 1,644.45 = 667.69 : x
  2. Step 2: Convert to fraction form
    1,191.65/1,644.45 = 667.69/x
  3. Step 3: Cross multiply
    1,191.65x = 1,644.45 × 667.69
  4. Step 4: Simplify right side
    1,191.65x = 1,097,982.82
  5. Step 5: Solve for x
    x = 1,097,982.82/1,191.65
  6. Step 6: Final answer
    x = 921.40

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Half scale
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Double scale
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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.