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Finding the Fourth Proportional to 146.48, 219.71 and 81.51

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Solution

The fourth proportional to 146.48, 219.71 and 81.51 is: 122.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.48 : 219.71 = 81.51 : x
  2. Step 2: Convert to fraction form
    146.48/219.71 = 81.51/x
  3. Step 3: Cross multiply
    146.48x = 219.71 × 81.51
  4. Step 4: Simplify right side
    146.48x = 17,908.15
  5. Step 5: Solve for x
    x = 17,908.15/146.48
  6. Step 6: Final answer
    x = 122.26

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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.