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Finding the Fourth Proportional to 66,820.17, 100,209.03 and 21,831.28

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Solution

The fourth proportional to 66,820.17, 100,209.03 and 21,831.28 is: 32,739.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,820.17 : 100,209.03 = 21,831.28 : x
  2. Step 2: Convert to fraction form
    66,820.17/100,209.03 = 21,831.28/x
  3. Step 3: Cross multiply
    66,820.17x = 100,209.03 × 21,831.28
  4. Step 4: Simplify right side
    66,820.17x = 2,187,691,392.46
  5. Step 5: Solve for x
    x = 2,187,691,392.46/66,820.17
  6. Step 6: Final answer
    x = 32,739.99

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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.