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Finding the Fourth Proportional to 154.61, 213.36 and 84.67

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Solution

The fourth proportional to 154.61, 213.36 and 84.67 is: 116.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.61 : 213.36 = 84.67 : x
  2. Step 2: Convert to fraction form
    154.61/213.36 = 84.67/x
  3. Step 3: Cross multiply
    154.61x = 213.36 × 84.67
  4. Step 4: Simplify right side
    154.61x = 18,064.78
  5. Step 5: Solve for x
    x = 18,064.78/154.61
  6. Step 6: Final answer
    x = 116.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.