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Finding the Fourth Proportional to 142,391.59, 196,483.21 and 78,720.73

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Solution

The fourth proportional to 142,391.59, 196,483.21 and 78,720.73 is: 108,625.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,391.59 : 196,483.21 = 78,720.73 : x
  2. Step 2: Convert to fraction form
    142,391.59/196,483.21 = 78,720.73/x
  3. Step 3: Cross multiply
    142,391.59x = 196,483.21 × 78,720.73
  4. Step 4: Simplify right side
    142,391.59x = 15,467,301,723.94
  5. Step 5: Solve for x
    x = 15,467,301,723.94/142,391.59
  6. Step 6: Final answer
    x = 108,625.11

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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.