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Finding the Fourth Proportional to 766.48, 1,149.75 and 218.74

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Solution

The fourth proportional to 766.48, 1,149.75 and 218.74 is: 328.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.48 : 1,149.75 = 218.74 : x
  2. Step 2: Convert to fraction form
    766.48/1,149.75 = 218.74/x
  3. Step 3: Cross multiply
    766.48x = 1,149.75 × 218.74
  4. Step 4: Simplify right side
    766.48x = 251,496.01
  5. Step 5: Solve for x
    x = 251,496.01/766.48
  6. Step 6: Final answer
    x = 328.12

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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.