Home / 100,981.13-139,353.21-55,659.20

Finding the Fourth Proportional to 100,981.13, 139,353.21 and 55,659.20

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Solution

The fourth proportional to 100,981.13, 139,353.21 and 55,659.20 is: 76,809.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,981.13 : 139,353.21 = 55,659.20 : x
  2. Step 2: Convert to fraction form
    100,981.13/139,353.21 = 55,659.20/x
  3. Step 3: Cross multiply
    100,981.13x = 139,353.21 × 55,659.20
  4. Step 4: Simplify right side
    100,981.13x = 7,756,287,489.27
  5. Step 5: Solve for x
    x = 7,756,287,489.27/100,981.13
  6. Step 6: Final answer
    x = 76,809.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.