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Finding the Fourth Proportional to 64,640.34, 96,960.51 and 20,270.55

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Solution

The fourth proportional to 64,640.34, 96,960.51 and 20,270.55 is: 30,405.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,640.34 : 96,960.51 = 20,270.55 : x
  2. Step 2: Convert to fraction form
    64,640.34/96,960.51 = 20,270.55/x
  3. Step 3: Cross multiply
    64,640.34x = 96,960.51 × 20,270.55
  4. Step 4: Simplify right side
    64,640.34x = 1,965,443,229.58
  5. Step 5: Solve for x
    x = 1,965,443,229.58/64,640.34
  6. Step 6: Final answer
    x = 30,405.83

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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.