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Finding the Fourth Proportional to 93.99, 140.05 and 89.85

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Solution

The fourth proportional to 93.99, 140.05 and 89.85 is: 133.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.99 : 140.05 = 89.85 : x
  2. Step 2: Convert to fraction form
    93.99/140.05 = 89.85/x
  3. Step 3: Cross multiply
    93.99x = 140.05 × 89.85
  4. Step 4: Simplify right side
    93.99x = 12,583.49
  5. Step 5: Solve for x
    x = 12,583.49/93.99
  6. Step 6: Final answer
    x = 133.88

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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.