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Finding the Fourth Proportional to 218.07, 326.98 and 100.81

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Solution

The fourth proportional to 218.07, 326.98 and 100.81 is: 151.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.07 : 326.98 = 100.81 : x
  2. Step 2: Convert to fraction form
    218.07/326.98 = 100.81/x
  3. Step 3: Cross multiply
    218.07x = 326.98 × 100.81
  4. Step 4: Simplify right side
    218.07x = 32,962.04
  5. Step 5: Solve for x
    x = 32,962.04/218.07
  6. Step 6: Final answer
    x = 151.16

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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.