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Finding the Fourth Proportional to 154.61, 231.94 and 86.09

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Solution

The fourth proportional to 154.61, 231.94 and 86.09 is: 129.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.61 : 231.94 = 86.09 : x
  2. Step 2: Convert to fraction form
    154.61/231.94 = 86.09/x
  3. Step 3: Cross multiply
    154.61x = 231.94 × 86.09
  4. Step 4: Simplify right side
    154.61x = 19,967.71
  5. Step 5: Solve for x
    x = 19,967.71/154.61
  6. Step 6: Final answer
    x = 129.15

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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.