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Finding the Fourth Proportional to 154.61, 231.61 and 89.61

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Solution

The fourth proportional to 154.61, 231.61 and 89.61 is: 134.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.61 : 231.61 = 89.61 : x
  2. Step 2: Convert to fraction form
    154.61/231.61 = 89.61/x
  3. Step 3: Cross multiply
    154.61x = 231.61 × 89.61
  4. Step 4: Simplify right side
    154.61x = 20,753.65
  5. Step 5: Solve for x
    x = 20,753.65/154.61
  6. Step 6: Final answer
    x = 134.23

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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.