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Finding the Fourth Proportional to 93.72, 140.46 and 74.40

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Solution

The fourth proportional to 93.72, 140.46 and 74.40 is: 111.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.72 : 140.46 = 74.40 : x
  2. Step 2: Convert to fraction form
    93.72/140.46 = 74.40/x
  3. Step 3: Cross multiply
    93.72x = 140.46 × 74.40
  4. Step 4: Simplify right side
    93.72x = 10,450.22
  5. Step 5: Solve for x
    x = 10,450.22/93.72
  6. Step 6: Final answer
    x = 111.50

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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.