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Finding the Fourth Proportional to 1,240.78, 1,860.09 and 829.71

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Solution

The fourth proportional to 1,240.78, 1,860.09 and 829.71 is: 1,243.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.78 : 1,860.09 = 829.71 : x
  2. Step 2: Convert to fraction form
    1,240.78/1,860.09 = 829.71/x
  3. Step 3: Cross multiply
    1,240.78x = 1,860.09 × 829.71
  4. Step 4: Simplify right side
    1,240.78x = 1,543,335.27
  5. Step 5: Solve for x
    x = 1,543,335.27/1,240.78
  6. Step 6: Final answer
    x = 1,243.84

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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.