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Finding the Fourth Proportional to 93.18, 139.70 and 72.94

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Solution

The fourth proportional to 93.18, 139.70 and 72.94 is: 109.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.18 : 139.70 = 72.94 : x
  2. Step 2: Convert to fraction form
    93.18/139.70 = 72.94/x
  3. Step 3: Cross multiply
    93.18x = 139.70 × 72.94
  4. Step 4: Simplify right side
    93.18x = 10,189.72
  5. Step 5: Solve for x
    x = 10,189.72/93.18
  6. Step 6: Final answer
    x = 109.36

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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.