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Finding the Fourth Proportional to 20,771, 31,156.50 and 6,179

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Solution

The fourth proportional to 20,771, 31,156.50 and 6,179 is: 9,268.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,771 : 31,156.50 = 6,179 : x
  2. Step 2: Convert to fraction form
    20,771/31,156.50 = 6,179/x
  3. Step 3: Cross multiply
    20,771x = 31,156.50 × 6,179
  4. Step 4: Simplify right side
    20,771x = 192,516,013.50
  5. Step 5: Solve for x
    x = 192,516,013.50/20,771
  6. Step 6: Final answer
    x = 9,268.50

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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.