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Finding the Fourth Proportional to 93.44, 138.90 and 90.71

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Solution

The fourth proportional to 93.44, 138.90 and 90.71 is: 134.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.44 : 138.90 = 90.71 : x
  2. Step 2: Convert to fraction form
    93.44/138.90 = 90.71/x
  3. Step 3: Cross multiply
    93.44x = 138.90 × 90.71
  4. Step 4: Simplify right side
    93.44x = 12,599.62
  5. Step 5: Solve for x
    x = 12,599.62/93.44
  6. Step 6: Final answer
    x = 134.84

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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.