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Finding the Fourth Proportional to 67,135.48, 100,696.72 and 20,388.76

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Solution

The fourth proportional to 67,135.48, 100,696.72 and 20,388.76 is: 30,581.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,135.48 : 100,696.72 = 20,388.76 : x
  2. Step 2: Convert to fraction form
    67,135.48/100,696.72 = 20,388.76/x
  3. Step 3: Cross multiply
    67,135.48x = 100,696.72 × 20,388.76
  4. Step 4: Simplify right side
    67,135.48x = 2,053,081,256.87
  5. Step 5: Solve for x
    x = 2,053,081,256.87/67,135.48
  6. Step 6: Final answer
    x = 30,581.17

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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.