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Finding the Fourth Proportional to 20,141.31, 30,211.85 and 7,829.31

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Solution

The fourth proportional to 20,141.31, 30,211.85 and 7,829.31 is: 11,743.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,141.31 : 30,211.85 = 7,829.31 : x
  2. Step 2: Convert to fraction form
    20,141.31/30,211.85 = 7,829.31/x
  3. Step 3: Cross multiply
    20,141.31x = 30,211.85 × 7,829.31
  4. Step 4: Simplify right side
    20,141.31x = 236,537,900.18
  5. Step 5: Solve for x
    x = 236,537,900.18/20,141.31
  6. Step 6: Final answer
    x = 11,743.92

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1.5x scale

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.