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Finding the Fourth Proportional to 766.64, 1,149.93 and 218.81

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Solution

The fourth proportional to 766.64, 1,149.93 and 218.81 is: 328.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.64 : 1,149.93 = 218.81 : x
  2. Step 2: Convert to fraction form
    766.64/1,149.93 = 218.81/x
  3. Step 3: Cross multiply
    766.64x = 1,149.93 × 218.81
  4. Step 4: Simplify right side
    766.64x = 251,616.18
  5. Step 5: Solve for x
    x = 251,616.18/766.64
  6. Step 6: Final answer
    x = 328.21

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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.