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Finding the Fourth Proportional to 1,191.39, 1,644.08 and 660.30

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Solution

The fourth proportional to 1,191.39, 1,644.08 and 660.30 is: 911.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.39 : 1,644.08 = 660.30 : x
  2. Step 2: Convert to fraction form
    1,191.39/1,644.08 = 660.30/x
  3. Step 3: Cross multiply
    1,191.39x = 1,644.08 × 660.30
  4. Step 4: Simplify right side
    1,191.39x = 1,085,586.02
  5. Step 5: Solve for x
    x = 1,085,586.02/1,191.39
  6. Step 6: Final answer
    x = 911.19

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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.