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Finding the Fourth Proportional to 154.48, 213.16 and 89

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Solution

The fourth proportional to 154.48, 213.16 and 89 is: 122.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.48 : 213.16 = 89 : x
  2. Step 2: Convert to fraction form
    154.48/213.16 = 89/x
  3. Step 3: Cross multiply
    154.48x = 213.16 × 89
  4. Step 4: Simplify right side
    154.48x = 18,971.24
  5. Step 5: Solve for x
    x = 18,971.24/154.48
  6. Step 6: Final answer
    x = 122.81

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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.