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Finding the Fourth Proportional to 1,191.41, 1,644.20 and 667.45

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Solution

The fourth proportional to 1,191.41, 1,644.20 and 667.45 is: 921.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.41 : 1,644.20 = 667.45 : x
  2. Step 2: Convert to fraction form
    1,191.41/1,644.20 = 667.45/x
  3. Step 3: Cross multiply
    1,191.41x = 1,644.20 × 667.45
  4. Step 4: Simplify right side
    1,191.41x = 1,097,409.73
  5. Step 5: Solve for x
    x = 1,097,409.73/1,191.41
  6. Step 6: Final answer
    x = 921.10

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.