Home / 20,813.76-31,219.68-7,665.24

Finding the Fourth Proportional to 20,813.76, 31,219.68 and 7,665.24

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Solution

The fourth proportional to 20,813.76, 31,219.68 and 7,665.24 is: 11,497.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,813.76 : 31,219.68 = 7,665.24 : x
  2. Step 2: Convert to fraction form
    20,813.76/31,219.68 = 7,665.24/x
  3. Step 3: Cross multiply
    20,813.76x = 31,219.68 × 7,665.24
  4. Step 4: Simplify right side
    20,813.76x = 239,306,339.92
  5. Step 5: Solve for x
    x = 239,306,339.92/20,813.76
  6. Step 6: Final answer
    x = 11,497.51

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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.