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Finding the Fourth Proportional to 93.20, 139.02 and 86.24

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Solution

The fourth proportional to 93.20, 139.02 and 86.24 is: 128.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.20 : 139.02 = 86.24 : x
  2. Step 2: Convert to fraction form
    93.20/139.02 = 86.24/x
  3. Step 3: Cross multiply
    93.20x = 139.02 × 86.24
  4. Step 4: Simplify right side
    93.20x = 11,989.08
  5. Step 5: Solve for x
    x = 11,989.08/93.20
  6. Step 6: Final answer
    x = 128.64

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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.