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Finding the Fourth Proportional to 93.08, 138.92 and 85.86

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Solution

The fourth proportional to 93.08, 138.92 and 85.86 is: 128.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.08 : 138.92 = 85.86 : x
  2. Step 2: Convert to fraction form
    93.08/138.92 = 85.86/x
  3. Step 3: Cross multiply
    93.08x = 138.92 × 85.86
  4. Step 4: Simplify right side
    93.08x = 11,927.24
  5. Step 5: Solve for x
    x = 11,927.24/93.08
  6. Step 6: Final answer
    x = 128.14

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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.