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Finding the Fourth Proportional to 786.71, 1,180.21 and 324.74

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Solution

The fourth proportional to 786.71, 1,180.21 and 324.74 is: 487.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.71 : 1,180.21 = 324.74 : x
  2. Step 2: Convert to fraction form
    786.71/1,180.21 = 324.74/x
  3. Step 3: Cross multiply
    786.71x = 1,180.21 × 324.74
  4. Step 4: Simplify right side
    786.71x = 383,261.40
  5. Step 5: Solve for x
    x = 383,261.40/786.71
  6. Step 6: Final answer
    x = 487.17

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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.