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Finding the Fourth Proportional to 218.19, 326.70 and 125.40

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Solution

The fourth proportional to 218.19, 326.70 and 125.40 is: 187.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.19 : 326.70 = 125.40 : x
  2. Step 2: Convert to fraction form
    218.19/326.70 = 125.40/x
  3. Step 3: Cross multiply
    218.19x = 326.70 × 125.40
  4. Step 4: Simplify right side
    218.19x = 40,968.18
  5. Step 5: Solve for x
    x = 40,968.18/218.19
  6. Step 6: Final answer
    x = 187.76

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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.