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Finding the Fourth Proportional to 89.75, 133.82 and 88.13

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Solution

The fourth proportional to 89.75, 133.82 and 88.13 is: 131.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.75 : 133.82 = 88.13 : x
  2. Step 2: Convert to fraction form
    89.75/133.82 = 88.13/x
  3. Step 3: Cross multiply
    89.75x = 133.82 × 88.13
  4. Step 4: Simplify right side
    89.75x = 11,792.45
  5. Step 5: Solve for x
    x = 11,792.45/89.75
  6. Step 6: Final answer
    x = 131.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.