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Finding the Fourth Proportional to 100,881, 139,215.78 and 56,179.56

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Solution

The fourth proportional to 100,881, 139,215.78 and 56,179.56 is: 77,527.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,881 : 139,215.78 = 56,179.56 : x
  2. Step 2: Convert to fraction form
    100,881/139,215.78 = 56,179.56/x
  3. Step 3: Cross multiply
    100,881x = 139,215.78 × 56,179.56
  4. Step 4: Simplify right side
    100,881x = 7,821,081,265.46
  5. Step 5: Solve for x
    x = 7,821,081,265.46/100,881
  6. Step 6: Final answer
    x = 77,527.79

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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.