Home / 20,831.76-31,247.64-6,990.48

Finding the Fourth Proportional to 20,831.76, 31,247.64 and 6,990.48

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Solution

The fourth proportional to 20,831.76, 31,247.64 and 6,990.48 is: 10,485.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.76 : 31,247.64 = 6,990.48 : x
  2. Step 2: Convert to fraction form
    20,831.76/31,247.64 = 6,990.48/x
  3. Step 3: Cross multiply
    20,831.76x = 31,247.64 × 6,990.48
  4. Step 4: Simplify right side
    20,831.76x = 218,436,002.47
  5. Step 5: Solve for x
    x = 218,436,002.47/20,831.76
  6. Step 6: Final answer
    x = 10,485.72

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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.