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Finding the Fourth Proportional to 424.04, 636.24 and 218.66

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Solution

The fourth proportional to 424.04, 636.24 and 218.66 is: 328.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.04 : 636.24 = 218.66 : x
  2. Step 2: Convert to fraction form
    424.04/636.24 = 218.66/x
  3. Step 3: Cross multiply
    424.04x = 636.24 × 218.66
  4. Step 4: Simplify right side
    424.04x = 139,120.24
  5. Step 5: Solve for x
    x = 139,120.24/424.04
  6. Step 6: Final answer
    x = 328.08

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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.