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Finding the Fourth Proportional to 154.20, 231.18 and 89.10

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Solution

The fourth proportional to 154.20, 231.18 and 89.10 is: 133.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.20 : 231.18 = 89.10 : x
  2. Step 2: Convert to fraction form
    154.20/231.18 = 89.10/x
  3. Step 3: Cross multiply
    154.20x = 231.18 × 89.10
  4. Step 4: Simplify right side
    154.20x = 20,598.14
  5. Step 5: Solve for x
    x = 20,598.14/154.20
  6. Step 6: Final answer
    x = 133.58

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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.