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Finding the Fourth Proportional to 93.08, 139.56 and 81.69

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Solution

The fourth proportional to 93.08, 139.56 and 81.69 is: 122.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.08 : 139.56 = 81.69 : x
  2. Step 2: Convert to fraction form
    93.08/139.56 = 81.69/x
  3. Step 3: Cross multiply
    93.08x = 139.56 × 81.69
  4. Step 4: Simplify right side
    93.08x = 11,399.55
  5. Step 5: Solve for x
    x = 11,399.55/93.08
  6. Step 6: Final answer
    x = 122.48

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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.