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Finding the Fourth Proportional to 93.60, 139.55 and 85.05

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Solution

The fourth proportional to 93.60, 139.55 and 85.05 is: 126.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.60 : 139.55 = 85.05 : x
  2. Step 2: Convert to fraction form
    93.60/139.55 = 85.05/x
  3. Step 3: Cross multiply
    93.60x = 139.55 × 85.05
  4. Step 4: Simplify right side
    93.60x = 11,868.30
  5. Step 5: Solve for x
    x = 11,868.30/93.60
  6. Step 6: Final answer
    x = 126.80

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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.