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Finding the Fourth Proportional to 93, 139.82 and 72.75

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Solution

The fourth proportional to 93, 139.82 and 72.75 is: 109.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    93 : 139.82 = 72.75 : x
  2. Step 2: Convert to fraction form
    93/139.82 = 72.75/x
  3. Step 3: Cross multiply
    93x = 139.82 × 72.75
  4. Step 4: Simplify right side
    93x = 10,171.54
  5. Step 5: Solve for x
    x = 10,171.54/93
  6. Step 6: Final answer
    x = 109.37

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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.