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Finding the Fourth Proportional to 153.66, 230.39 and 81.57

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Solution

The fourth proportional to 153.66, 230.39 and 81.57 is: 122.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.66 : 230.39 = 81.57 : x
  2. Step 2: Convert to fraction form
    153.66/230.39 = 81.57/x
  3. Step 3: Cross multiply
    153.66x = 230.39 × 81.57
  4. Step 4: Simplify right side
    153.66x = 18,792.50
  5. Step 5: Solve for x
    x = 18,792.50/153.66
  6. Step 6: Final answer
    x = 122.30

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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.