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Finding the Fourth Proportional to 158.75, 238.14 and 81.67

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Solution

The fourth proportional to 158.75, 238.14 and 81.67 is: 122.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.75 : 238.14 = 81.67 : x
  2. Step 2: Convert to fraction form
    158.75/238.14 = 81.67/x
  3. Step 3: Cross multiply
    158.75x = 238.14 × 81.67
  4. Step 4: Simplify right side
    158.75x = 19,448.89
  5. Step 5: Solve for x
    x = 19,448.89/158.75
  6. Step 6: Final answer
    x = 122.51

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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.