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Finding the Fourth Proportional to 154.72, 231.89 and 77.51

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Solution

The fourth proportional to 154.72, 231.89 and 77.51 is: 116.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.72 : 231.89 = 77.51 : x
  2. Step 2: Convert to fraction form
    154.72/231.89 = 77.51/x
  3. Step 3: Cross multiply
    154.72x = 231.89 × 77.51
  4. Step 4: Simplify right side
    154.72x = 17,972.83
  5. Step 5: Solve for x
    x = 17,972.83/154.72
  6. Step 6: Final answer
    x = 116.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.