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Finding the Fourth Proportional to 218.18, 300.15 and 212.10

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Solution

The fourth proportional to 218.18, 300.15 and 212.10 is: 291.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.18 : 300.15 = 212.10 : x
  2. Step 2: Convert to fraction form
    218.18/300.15 = 212.10/x
  3. Step 3: Cross multiply
    218.18x = 300.15 × 212.10
  4. Step 4: Simplify right side
    218.18x = 63,661.82
  5. Step 5: Solve for x
    x = 63,661.82/218.18
  6. Step 6: Final answer
    x = 291.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.