Home / 20,821.25-31,215.47-7,666.44

Finding the Fourth Proportional to 20,821.25, 31,215.47 and 7,666.44

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Solution

The fourth proportional to 20,821.25, 31,215.47 and 7,666.44 is: 11,493.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.25 : 31,215.47 = 7,666.44 : x
  2. Step 2: Convert to fraction form
    20,821.25/31,215.47 = 7,666.44/x
  3. Step 3: Cross multiply
    20,821.25x = 31,215.47 × 7,666.44
  4. Step 4: Simplify right side
    20,821.25x = 239,311,489.49
  5. Step 5: Solve for x
    x = 239,311,489.49/20,821.25
  6. Step 6: Final answer
    x = 11,493.62

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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.