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Finding the Fourth Proportional to 786.71, 1,180.13 and 324.71

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Solution

The fourth proportional to 786.71, 1,180.13 and 324.71 is: 487.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.71 : 1,180.13 = 324.71 : x
  2. Step 2: Convert to fraction form
    786.71/1,180.13 = 324.71/x
  3. Step 3: Cross multiply
    786.71x = 1,180.13 × 324.71
  4. Step 4: Simplify right side
    786.71x = 383,196.91
  5. Step 5: Solve for x
    x = 383,196.91/786.71
  6. Step 6: Final answer
    x = 487.09

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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.