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Finding the Fourth Proportional to 93.28, 139.74 and 77.08

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Solution

The fourth proportional to 93.28, 139.74 and 77.08 is: 115.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.28 : 139.74 = 77.08 : x
  2. Step 2: Convert to fraction form
    93.28/139.74 = 77.08/x
  3. Step 3: Cross multiply
    93.28x = 139.74 × 77.08
  4. Step 4: Simplify right side
    93.28x = 10,771.16
  5. Step 5: Solve for x
    x = 10,771.16/93.28
  6. Step 6: Final answer
    x = 115.47

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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.