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Finding the Fourth Proportional to 93.80, 140.49 and 90.77

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Solution

The fourth proportional to 93.80, 140.49 and 90.77 is: 135.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.80 : 140.49 = 90.77 : x
  2. Step 2: Convert to fraction form
    93.80/140.49 = 90.77/x
  3. Step 3: Cross multiply
    93.80x = 140.49 × 90.77
  4. Step 4: Simplify right side
    93.80x = 12,751.57
  5. Step 5: Solve for x
    x = 12,751.57/93.80
  6. Step 6: Final answer
    x = 135.95

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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.