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Finding the Fourth Proportional to 93.60, 139.92 and 85.44

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Solution

The fourth proportional to 93.60, 139.92 and 85.44 is: 127.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.60 : 139.92 = 85.44 : x
  2. Step 2: Convert to fraction form
    93.60/139.92 = 85.44/x
  3. Step 3: Cross multiply
    93.60x = 139.92 × 85.44
  4. Step 4: Simplify right side
    93.60x = 11,954.76
  5. Step 5: Solve for x
    x = 11,954.76/93.60
  6. Step 6: Final answer
    x = 127.72

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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.