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Finding the Fourth Proportional to 221.13, 305.18 and 155.66

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Solution

The fourth proportional to 221.13, 305.18 and 155.66 is: 214.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.13 : 305.18 = 155.66 : x
  2. Step 2: Convert to fraction form
    221.13/305.18 = 155.66/x
  3. Step 3: Cross multiply
    221.13x = 305.18 × 155.66
  4. Step 4: Simplify right side
    221.13x = 47,502.01
  5. Step 5: Solve for x
    x = 47,502.01/221.13
  6. Step 6: Final answer
    x = 214.81

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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.