Home / 20,831.24-31,232.28-7,680.08

Finding the Fourth Proportional to 20,831.24, 31,232.28 and 7,680.08

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Solution

The fourth proportional to 20,831.24, 31,232.28 and 7,680.08 is: 11,514.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.24 : 31,232.28 = 7,680.08 : x
  2. Step 2: Convert to fraction form
    20,831.24/31,232.28 = 7,680.08/x
  3. Step 3: Cross multiply
    20,831.24x = 31,232.28 × 7,680.08
  4. Step 4: Simplify right side
    20,831.24x = 239,866,408.98
  5. Step 5: Solve for x
    x = 239,866,408.98/20,831.24
  6. Step 6: Final answer
    x = 11,514.74

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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.