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Finding the Fourth Proportional to 15,153.90, 20,911.78 and 8,439.80

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Solution

The fourth proportional to 15,153.90, 20,911.78 and 8,439.80 is: 11,646.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,153.90 : 20,911.78 = 8,439.80 : x
  2. Step 2: Convert to fraction form
    15,153.90/20,911.78 = 8,439.80/x
  3. Step 3: Cross multiply
    15,153.90x = 20,911.78 × 8,439.80
  4. Step 4: Simplify right side
    15,153.90x = 176,491,240.84
  5. Step 5: Solve for x
    x = 176,491,240.84/15,153.90
  6. Step 6: Final answer
    x = 11,646.59

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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.