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Finding the Fourth Proportional to 20,911, 31,366.50 and 8,599

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Solution

The fourth proportional to 20,911, 31,366.50 and 8,599 is: 12,898.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911 : 31,366.50 = 8,599 : x
  2. Step 2: Convert to fraction form
    20,911/31,366.50 = 8,599/x
  3. Step 3: Cross multiply
    20,911x = 31,366.50 × 8,599
  4. Step 4: Simplify right side
    20,911x = 269,720,533.50
  5. Step 5: Solve for x
    x = 269,720,533.50/20,911
  6. Step 6: Final answer
    x = 12,898.50

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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.