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Finding the Fourth Proportional to 93.30, 138.77 and 91.68

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Solution

The fourth proportional to 93.30, 138.77 and 91.68 is: 136.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.30 : 138.77 = 91.68 : x
  2. Step 2: Convert to fraction form
    93.30/138.77 = 91.68/x
  3. Step 3: Cross multiply
    93.30x = 138.77 × 91.68
  4. Step 4: Simplify right side
    93.30x = 12,721.98
  5. Step 5: Solve for x
    x = 12,721.98/93.30
  6. Step 6: Final answer
    x = 136.36

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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.