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Finding the Fourth Proportional to 143,409.81, 197,910.36 and 78,881.79

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Solution

The fourth proportional to 143,409.81, 197,910.36 and 78,881.79 is: 108,859.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,409.81 : 197,910.36 = 78,881.79 : x
  2. Step 2: Convert to fraction form
    143,409.81/197,910.36 = 78,881.79/x
  3. Step 3: Cross multiply
    143,409.81x = 197,910.36 × 78,881.79
  4. Step 4: Simplify right side
    143,409.81x = 15,611,523,456.34
  5. Step 5: Solve for x
    x = 15,611,523,456.34/143,409.81
  6. Step 6: Final answer
    x = 108,859.52

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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.