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Finding the Fourth Proportional to 1,191.32, 1,644.08 and 667.40

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Solution

The fourth proportional to 1,191.32, 1,644.08 and 667.40 is: 921.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.32 : 1,644.08 = 667.40 : x
  2. Step 2: Convert to fraction form
    1,191.32/1,644.08 = 667.40/x
  3. Step 3: Cross multiply
    1,191.32x = 1,644.08 × 667.40
  4. Step 4: Simplify right side
    1,191.32x = 1,097,258.99
  5. Step 5: Solve for x
    x = 1,097,258.99/1,191.32
  6. Step 6: Final answer
    x = 921.04

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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.