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Finding the Fourth Proportional to 218.18, 300.96 and 155.90

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Solution

The fourth proportional to 218.18, 300.96 and 155.90 is: 215.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.18 : 300.96 = 155.90 : x
  2. Step 2: Convert to fraction form
    218.18/300.96 = 155.90/x
  3. Step 3: Cross multiply
    218.18x = 300.96 × 155.90
  4. Step 4: Simplify right side
    218.18x = 46,920.69
  5. Step 5: Solve for x
    x = 46,920.69/218.18
  6. Step 6: Final answer
    x = 215.05

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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.