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Finding the Fourth Proportional to 93.21, 138.94 and 90.65

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Solution

The fourth proportional to 93.21, 138.94 and 90.65 is: 135.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.21 : 138.94 = 90.65 : x
  2. Step 2: Convert to fraction form
    93.21/138.94 = 90.65/x
  3. Step 3: Cross multiply
    93.21x = 138.94 × 90.65
  4. Step 4: Simplify right side
    93.21x = 12,593.76
  5. Step 5: Solve for x
    x = 12,593.76/93.21
  6. Step 6: Final answer
    x = 135.11

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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.