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Finding the Fourth Proportional to 15,579.20, 21,499.20 and 8,505.69

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Solution

The fourth proportional to 15,579.20, 21,499.20 and 8,505.69 is: 11,737.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,579.20 : 21,499.20 = 8,505.69 : x
  2. Step 2: Convert to fraction form
    15,579.20/21,499.20 = 8,505.69/x
  3. Step 3: Cross multiply
    15,579.20x = 21,499.20 × 8,505.69
  4. Step 4: Simplify right side
    15,579.20x = 182,865,530.45
  5. Step 5: Solve for x
    x = 182,865,530.45/15,579.20
  6. Step 6: Final answer
    x = 11,737.80

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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.