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Finding the Fourth Proportional to 154.74, 231.60 and 86.10

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Solution

The fourth proportional to 154.74, 231.60 and 86.10 is: 128.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.74 : 231.60 = 86.10 : x
  2. Step 2: Convert to fraction form
    154.74/231.60 = 86.10/x
  3. Step 3: Cross multiply
    154.74x = 231.60 × 86.10
  4. Step 4: Simplify right side
    154.74x = 19,940.76
  5. Step 5: Solve for x
    x = 19,940.76/154.74
  6. Step 6: Final answer
    x = 128.87

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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.