Home / 20,831.40-31,247.10-14,221.80

Finding the Fourth Proportional to 20,831.40, 31,247.10 and 14,221.80

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Solution

The fourth proportional to 20,831.40, 31,247.10 and 14,221.80 is: 21,332.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.40 : 31,247.10 = 14,221.80 : x
  2. Step 2: Convert to fraction form
    20,831.40/31,247.10 = 14,221.80/x
  3. Step 3: Cross multiply
    20,831.40x = 31,247.10 × 14,221.80
  4. Step 4: Simplify right side
    20,831.40x = 444,390,006.78
  5. Step 5: Solve for x
    x = 444,390,006.78/20,831.40
  6. Step 6: Final answer
    x = 21,332.70

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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.