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Finding the Fourth Proportional to 424.02, 636.06 and 218.74

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Solution

The fourth proportional to 424.02, 636.06 and 218.74 is: 328.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.02 : 636.06 = 218.74 : x
  2. Step 2: Convert to fraction form
    424.02/636.06 = 218.74/x
  3. Step 3: Cross multiply
    424.02x = 636.06 × 218.74
  4. Step 4: Simplify right side
    424.02x = 139,131.76
  5. Step 5: Solve for x
    x = 139,131.76/424.02
  6. Step 6: Final answer
    x = 328.13

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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.