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Finding the Fourth Proportional to 100,861.92, 139,186.94 and 55,539.54

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Solution

The fourth proportional to 100,861.92, 139,186.94 and 55,539.54 is: 76,643.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,861.92 : 139,186.94 = 55,539.54 : x
  2. Step 2: Convert to fraction form
    100,861.92/139,186.94 = 55,539.54/x
  3. Step 3: Cross multiply
    100,861.92x = 139,186.94 × 55,539.54
  4. Step 4: Simplify right side
    100,861.92x = 7,730,378,343.91
  5. Step 5: Solve for x
    x = 7,730,378,343.91/100,861.92
  6. Step 6: Final answer
    x = 76,643.18

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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.