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Finding the Fourth Proportional to 93.04, 139.50 and 85.85

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Solution

The fourth proportional to 93.04, 139.50 and 85.85 is: 128.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.04 : 139.50 = 85.85 : x
  2. Step 2: Convert to fraction form
    93.04/139.50 = 85.85/x
  3. Step 3: Cross multiply
    93.04x = 139.50 × 85.85
  4. Step 4: Simplify right side
    93.04x = 11,976.08
  5. Step 5: Solve for x
    x = 11,976.08/93.04
  6. Step 6: Final answer
    x = 128.72

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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.