Home / 20,812.23-31,215.20-7,661.48

Finding the Fourth Proportional to 20,812.23, 31,215.20 and 7,661.48

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Solution

The fourth proportional to 20,812.23, 31,215.20 and 7,661.48 is: 11,491.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.23 : 31,215.20 = 7,661.48 : x
  2. Step 2: Convert to fraction form
    20,812.23/31,215.20 = 7,661.48/x
  3. Step 3: Cross multiply
    20,812.23x = 31,215.20 × 7,661.48
  4. Step 4: Simplify right side
    20,812.23x = 239,154,436.11
  5. Step 5: Solve for x
    x = 239,154,436.11/20,812.23
  6. Step 6: Final answer
    x = 11,491.05

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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.