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Finding the Fourth Proportional to 197,879.18, 272,978.19 and 129,868.94

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Solution

The fourth proportional to 197,879.18, 272,978.19 and 129,868.94 is: 179,156.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    197,879.18 : 272,978.19 = 129,868.94 : x
  2. Step 2: Convert to fraction form
    197,879.18/272,978.19 = 129,868.94/x
  3. Step 3: Cross multiply
    197,879.18x = 272,978.19 × 129,868.94
  4. Step 4: Simplify right side
    197,879.18x = 35,451,388,178.42
  5. Step 5: Solve for x
    x = 35,451,388,178.42/197,879.18
  6. Step 6: Final answer
    x = 179,156.74

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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.