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Finding the Fourth Proportional to 159.91, 220.73 and 154.78

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Solution

The fourth proportional to 159.91, 220.73 and 154.78 is: 213.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.91 : 220.73 = 154.78 : x
  2. Step 2: Convert to fraction form
    159.91/220.73 = 154.78/x
  3. Step 3: Cross multiply
    159.91x = 220.73 × 154.78
  4. Step 4: Simplify right side
    159.91x = 34,162.71
  5. Step 5: Solve for x
    x = 34,162.71/159.91
  6. Step 6: Final answer
    x = 213.64

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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.