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Finding the Fourth Proportional to 40,955.52, 61,431.12 and 20,172

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Solution

The fourth proportional to 40,955.52, 61,431.12 and 20,172 is: 30,256.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,955.52 : 61,431.12 = 20,172 : x
  2. Step 2: Convert to fraction form
    40,955.52/61,431.12 = 20,172/x
  3. Step 3: Cross multiply
    40,955.52x = 61,431.12 × 20,172
  4. Step 4: Simplify right side
    40,955.52x = 1,239,188,552.64
  5. Step 5: Solve for x
    x = 1,239,188,552.64/40,955.52
  6. Step 6: Final answer
    x = 30,256.94

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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.