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Finding the Fourth Proportional to 142,793, 197,062.20 and 79,129.40

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Solution

The fourth proportional to 142,793, 197,062.20 and 79,129.40 is: 109,202.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,793 : 197,062.20 = 79,129.40 : x
  2. Step 2: Convert to fraction form
    142,793/197,062.20 = 79,129.40/x
  3. Step 3: Cross multiply
    142,793x = 197,062.20 × 79,129.40
  4. Step 4: Simplify right side
    142,793x = 15,593,413,648.68
  5. Step 5: Solve for x
    x = 15,593,413,648.68/142,793
  6. Step 6: Final answer
    x = 109,202.93

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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.