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Finding the Fourth Proportional to 18,919.40, 28,520.79 and 17,650.76

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Solution

The fourth proportional to 18,919.40, 28,520.79 and 17,650.76 is: 26,608.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.40 : 28,520.79 = 17,650.76 : x
  2. Step 2: Convert to fraction form
    18,919.40/28,520.79 = 17,650.76/x
  3. Step 3: Cross multiply
    18,919.40x = 28,520.79 × 17,650.76
  4. Step 4: Simplify right side
    18,919.40x = 503,413,619.30
  5. Step 5: Solve for x
    x = 503,413,619.30/18,919.40
  6. Step 6: Final answer
    x = 26,608.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.