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Finding the Fourth Proportional to 17,715.20, 26,601.60 and 12,819.20

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Solution

The fourth proportional to 17,715.20, 26,601.60 and 12,819.20 is: 19,249.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,715.20 : 26,601.60 = 12,819.20 : x
  2. Step 2: Convert to fraction form
    17,715.20/26,601.60 = 12,819.20/x
  3. Step 3: Cross multiply
    17,715.20x = 26,601.60 × 12,819.20
  4. Step 4: Simplify right side
    17,715.20x = 341,011,230.72
  5. Step 5: Solve for x
    x = 341,011,230.72/17,715.20
  6. Step 6: Final answer
    x = 19,249.64

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1.5x scale

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.