Home / 20,828.80-31,246.16-7,680.15

Finding the Fourth Proportional to 20,828.80, 31,246.16 and 7,680.15

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Solution

The fourth proportional to 20,828.80, 31,246.16 and 7,680.15 is: 11,521.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,828.80 : 31,246.16 = 7,680.15 : x
  2. Step 2: Convert to fraction form
    20,828.80/31,246.16 = 7,680.15/x
  3. Step 3: Cross multiply
    20,828.80x = 31,246.16 × 7,680.15
  4. Step 4: Simplify right side
    20,828.80x = 239,975,039.49
  5. Step 5: Solve for x
    x = 239,975,039.49/20,828.80
  6. Step 6: Final answer
    x = 11,521.31

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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.