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Finding the Fourth Proportional to 1,191.59, 1,644.34 and 660.47

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Solution

The fourth proportional to 1,191.59, 1,644.34 and 660.47 is: 911.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.59 : 1,644.34 = 660.47 : x
  2. Step 2: Convert to fraction form
    1,191.59/1,644.34 = 660.47/x
  3. Step 3: Cross multiply
    1,191.59x = 1,644.34 × 660.47
  4. Step 4: Simplify right side
    1,191.59x = 1,086,029.99
  5. Step 5: Solve for x
    x = 1,086,029.99/1,191.59
  6. Step 6: Final answer
    x = 911.42

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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.