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Finding the Fourth Proportional to 786.24, 1,180.71 and 751.61

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Solution

The fourth proportional to 786.24, 1,180.71 and 751.61 is: 1,128.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.24 : 1,180.71 = 751.61 : x
  2. Step 2: Convert to fraction form
    786.24/1,180.71 = 751.61/x
  3. Step 3: Cross multiply
    786.24x = 1,180.71 × 751.61
  4. Step 4: Simplify right side
    786.24x = 887,436.39
  5. Step 5: Solve for x
    x = 887,436.39/786.24
  6. Step 6: Final answer
    x = 1,128.71

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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.