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Finding the Fourth Proportional to 210,369.20, 315,456.60 and 91,979.60

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Solution

The fourth proportional to 210,369.20, 315,456.60 and 91,979.60 is: 137,926.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,369.20 : 315,456.60 = 91,979.60 : x
  2. Step 2: Convert to fraction form
    210,369.20/315,456.60 = 91,979.60/x
  3. Step 3: Cross multiply
    210,369.20x = 315,456.60 × 91,979.60
  4. Step 4: Simplify right side
    210,369.20x = 29,015,571,885.36
  5. Step 5: Solve for x
    x = 29,015,571,885.36/210,369.20
  6. Step 6: Final answer
    x = 137,926.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.