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Finding the Fourth Proportional to 93.76, 140.40 and 55.22

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Solution

The fourth proportional to 93.76, 140.40 and 55.22 is: 82.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.76 : 140.40 = 55.22 : x
  2. Step 2: Convert to fraction form
    93.76/140.40 = 55.22/x
  3. Step 3: Cross multiply
    93.76x = 140.40 × 55.22
  4. Step 4: Simplify right side
    93.76x = 7,752.19
  5. Step 5: Solve for x
    x = 7,752.19/93.76
  6. Step 6: Final answer
    x = 82.68

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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.