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Finding the Fourth Proportional to 15,153.88, 20,911.08 and 8,439

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Solution

The fourth proportional to 15,153.88, 20,911.08 and 8,439 is: 11,645.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,153.88 : 20,911.08 = 8,439 : x
  2. Step 2: Convert to fraction form
    15,153.88/20,911.08 = 8,439/x
  3. Step 3: Cross multiply
    15,153.88x = 20,911.08 × 8,439
  4. Step 4: Simplify right side
    15,153.88x = 176,468,604.12
  5. Step 5: Solve for x
    x = 176,468,604.12/15,153.88
  6. Step 6: Final answer
    x = 11,645.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.