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Finding the Fourth Proportional to 93.75, 140.37 and 85.95

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Solution

The fourth proportional to 93.75, 140.37 and 85.95 is: 128.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.75 : 140.37 = 85.95 : x
  2. Step 2: Convert to fraction form
    93.75/140.37 = 85.95/x
  3. Step 3: Cross multiply
    93.75x = 140.37 × 85.95
  4. Step 4: Simplify right side
    93.75x = 12,064.80
  5. Step 5: Solve for x
    x = 12,064.80/93.75
  6. Step 6: Final answer
    x = 128.69

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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.