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Finding the Fourth Proportional to 1,180.47, 1,770.72 and 660.39

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Solution

The fourth proportional to 1,180.47, 1,770.72 and 660.39 is: 990.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.47 : 1,770.72 = 660.39 : x
  2. Step 2: Convert to fraction form
    1,180.47/1,770.72 = 660.39/x
  3. Step 3: Cross multiply
    1,180.47x = 1,770.72 × 660.39
  4. Step 4: Simplify right side
    1,180.47x = 1,169,365.78
  5. Step 5: Solve for x
    x = 1,169,365.78/1,180.47
  6. Step 6: Final answer
    x = 990.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.