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Finding the Fourth Proportional to 93.27, 138.91 and 87.75

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Solution

The fourth proportional to 93.27, 138.91 and 87.75 is: 130.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.27 : 138.91 = 87.75 : x
  2. Step 2: Convert to fraction form
    93.27/138.91 = 87.75/x
  3. Step 3: Cross multiply
    93.27x = 138.91 × 87.75
  4. Step 4: Simplify right side
    93.27x = 12,189.13
  5. Step 5: Solve for x
    x = 12,189.13/93.27
  6. Step 6: Final answer
    x = 130.69

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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.