Home / 20,285.46-30,429.80-7,140.78

Finding the Fourth Proportional to 20,285.46, 30,429.80 and 7,140.78

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Solution

The fourth proportional to 20,285.46, 30,429.80 and 7,140.78 is: 10,711.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,285.46 : 30,429.80 = 7,140.78 : x
  2. Step 2: Convert to fraction form
    20,285.46/30,429.80 = 7,140.78/x
  3. Step 3: Cross multiply
    20,285.46x = 30,429.80 × 7,140.78
  4. Step 4: Simplify right side
    20,285.46x = 217,292,471.54
  5. Step 5: Solve for x
    x = 217,292,471.54/20,285.46
  6. Step 6: Final answer
    x = 10,711.73

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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.