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Finding the Fourth Proportional to 18,934.20, 26,107.65 and 15,520.50

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Solution

The fourth proportional to 18,934.20, 26,107.65 and 15,520.50 is: 21,400.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,934.20 : 26,107.65 = 15,520.50 : x
  2. Step 2: Convert to fraction form
    18,934.20/26,107.65 = 15,520.50/x
  3. Step 3: Cross multiply
    18,934.20x = 26,107.65 × 15,520.50
  4. Step 4: Simplify right side
    18,934.20x = 405,203,781.83
  5. Step 5: Solve for x
    x = 405,203,781.83/18,934.20
  6. Step 6: Final answer
    x = 21,400.63

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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.