Home / 142,120.72-196,127.20-78,459.04

Finding the Fourth Proportional to 142,120.72, 196,127.20 and 78,459.04

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Solution

The fourth proportional to 142,120.72, 196,127.20 and 78,459.04 is: 108,273.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,120.72 : 196,127.20 = 78,459.04 : x
  2. Step 2: Convert to fraction form
    142,120.72/196,127.20 = 78,459.04/x
  3. Step 3: Cross multiply
    142,120.72x = 196,127.20 × 78,459.04
  4. Step 4: Simplify right side
    142,120.72x = 15,387,951,829.89
  5. Step 5: Solve for x
    x = 15,387,951,829.89/142,120.72
  6. Step 6: Final answer
    x = 108,273.81

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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.