Home / 20,826.90-31,247.55-9,138.42

Finding the Fourth Proportional to 20,826.90, 31,247.55 and 9,138.42

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Solution

The fourth proportional to 20,826.90, 31,247.55 and 9,138.42 is: 13,710.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,826.90 : 31,247.55 = 9,138.42 : x
  2. Step 2: Convert to fraction form
    20,826.90/31,247.55 = 9,138.42/x
  3. Step 3: Cross multiply
    20,826.90x = 31,247.55 × 9,138.42
  4. Step 4: Simplify right side
    20,826.90x = 285,553,235.87
  5. Step 5: Solve for x
    x = 285,553,235.87/20,826.90
  6. Step 6: Final answer
    x = 13,710.79

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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.