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Finding the Fourth Proportional to 1,180.95, 1,770.26 and 661.39

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Solution

The fourth proportional to 1,180.95, 1,770.26 and 661.39 is: 991.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.95 : 1,770.26 = 661.39 : x
  2. Step 2: Convert to fraction form
    1,180.95/1,770.26 = 661.39/x
  3. Step 3: Cross multiply
    1,180.95x = 1,770.26 × 661.39
  4. Step 4: Simplify right side
    1,180.95x = 1,170,828.95
  5. Step 5: Solve for x
    x = 1,170,828.95/1,180.95
  6. Step 6: Final answer
    x = 991.43

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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.