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Finding the Fourth Proportional to 92.87, 138.25 and 88.45

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Solution

The fourth proportional to 92.87, 138.25 and 88.45 is: 131.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.87 : 138.25 = 88.45 : x
  2. Step 2: Convert to fraction form
    92.87/138.25 = 88.45/x
  3. Step 3: Cross multiply
    92.87x = 138.25 × 88.45
  4. Step 4: Simplify right side
    92.87x = 12,228.43
  5. Step 5: Solve for x
    x = 12,228.43/92.87
  6. Step 6: Final answer
    x = 131.67

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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.