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Finding the Fourth Proportional to 88.43, 133.21 and 81.75

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Solution

The fourth proportional to 88.43, 133.21 and 81.75 is: 123.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.43 : 133.21 = 81.75 : x
  2. Step 2: Convert to fraction form
    88.43/133.21 = 81.75/x
  3. Step 3: Cross multiply
    88.43x = 133.21 × 81.75
  4. Step 4: Simplify right side
    88.43x = 10,889.51
  5. Step 5: Solve for x
    x = 10,889.51/88.43
  6. Step 6: Final answer
    x = 123.14

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.