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Finding the Fourth Proportional to 93.42, 139.46 and 80.66

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Solution

The fourth proportional to 93.42, 139.46 and 80.66 is: 120.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.42 : 139.46 = 80.66 : x
  2. Step 2: Convert to fraction form
    93.42/139.46 = 80.66/x
  3. Step 3: Cross multiply
    93.42x = 139.46 × 80.66
  4. Step 4: Simplify right side
    93.42x = 11,248.79
  5. Step 5: Solve for x
    x = 11,248.79/93.42
  6. Step 6: Final answer
    x = 120.41

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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.