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Finding the Fourth Proportional to 153,979.20, 230,968.80 and 131,428.80

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Solution

The fourth proportional to 153,979.20, 230,968.80 and 131,428.80 is: 197,143.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,979.20 : 230,968.80 = 131,428.80 : x
  2. Step 2: Convert to fraction form
    153,979.20/230,968.80 = 131,428.80/x
  3. Step 3: Cross multiply
    153,979.20x = 230,968.80 × 131,428.80
  4. Step 4: Simplify right side
    153,979.20x = 30,355,952,221.44
  5. Step 5: Solve for x
    x = 30,355,952,221.44/153,979.20
  6. Step 6: Final answer
    x = 197,143.20

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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.