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Finding the Fourth Proportional to 423.94, 636.51 and 218.66

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Solution

The fourth proportional to 423.94, 636.51 and 218.66 is: 328.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.94 : 636.51 = 218.66 : x
  2. Step 2: Convert to fraction form
    423.94/636.51 = 218.66/x
  3. Step 3: Cross multiply
    423.94x = 636.51 × 218.66
  4. Step 4: Simplify right side
    423.94x = 139,179.28
  5. Step 5: Solve for x
    x = 139,179.28/423.94
  6. Step 6: Final answer
    x = 328.30

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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.