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Finding the Fourth Proportional to 93.87, 129.49 and 69.28

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Solution

The fourth proportional to 93.87, 129.49 and 69.28 is: 95.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.87 : 129.49 = 69.28 : x
  2. Step 2: Convert to fraction form
    93.87/129.49 = 69.28/x
  3. Step 3: Cross multiply
    93.87x = 129.49 × 69.28
  4. Step 4: Simplify right side
    93.87x = 8,970.57
  5. Step 5: Solve for x
    x = 8,970.57/93.87
  6. Step 6: Final answer
    x = 95.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.