Home / 20,809.80-31,217.40-10,285.20

Finding the Fourth Proportional to 20,809.80, 31,217.40 and 10,285.20

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Solution

The fourth proportional to 20,809.80, 31,217.40 and 10,285.20 is: 15,429.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.80 : 31,217.40 = 10,285.20 : x
  2. Step 2: Convert to fraction form
    20,809.80/31,217.40 = 10,285.20/x
  3. Step 3: Cross multiply
    20,809.80x = 31,217.40 × 10,285.20
  4. Step 4: Simplify right side
    20,809.80x = 321,077,202.48
  5. Step 5: Solve for x
    x = 321,077,202.48/20,809.80
  6. Step 6: Final answer
    x = 15,429.13

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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.