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Finding the Fourth Proportional to 154.72, 213.06 and 115.84

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Solution

The fourth proportional to 154.72, 213.06 and 115.84 is: 159.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.72 : 213.06 = 115.84 : x
  2. Step 2: Convert to fraction form
    154.72/213.06 = 115.84/x
  3. Step 3: Cross multiply
    154.72x = 213.06 × 115.84
  4. Step 4: Simplify right side
    154.72x = 24,680.87
  5. Step 5: Solve for x
    x = 24,680.87/154.72
  6. Step 6: Final answer
    x = 159.52

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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.