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Finding the Fourth Proportional to 93.15, 139.78 and 41.85

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Solution

The fourth proportional to 93.15, 139.78 and 41.85 is: 62.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.15 : 139.78 = 41.85 : x
  2. Step 2: Convert to fraction form
    93.15/139.78 = 41.85/x
  3. Step 3: Cross multiply
    93.15x = 139.78 × 41.85
  4. Step 4: Simplify right side
    93.15x = 5,849.79
  5. Step 5: Solve for x
    x = 5,849.79/93.15
  6. Step 6: Final answer
    x = 62.80

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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.