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Finding the Fourth Proportional to 20,761, 31,141.50 and 6,169

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Solution

The fourth proportional to 20,761, 31,141.50 and 6,169 is: 9,253.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761 : 31,141.50 = 6,169 : x
  2. Step 2: Convert to fraction form
    20,761/31,141.50 = 6,169/x
  3. Step 3: Cross multiply
    20,761x = 31,141.50 × 6,169
  4. Step 4: Simplify right side
    20,761x = 192,111,913.50
  5. Step 5: Solve for x
    x = 192,111,913.50/20,761
  6. Step 6: Final answer
    x = 9,253.50

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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.