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Finding the Fourth Proportional to 1,191.39, 1,644.09 and 667.53

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Solution

The fourth proportional to 1,191.39, 1,644.09 and 667.53 is: 921.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.39 : 1,644.09 = 667.53 : x
  2. Step 2: Convert to fraction form
    1,191.39/1,644.09 = 667.53/x
  3. Step 3: Cross multiply
    1,191.39x = 1,644.09 × 667.53
  4. Step 4: Simplify right side
    1,191.39x = 1,097,479.40
  5. Step 5: Solve for x
    x = 1,097,479.40/1,191.39
  6. Step 6: Final answer
    x = 921.18

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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.