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Finding the Fourth Proportional to 20,459.48, 30,689.81 and 7,979.00

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Solution

The fourth proportional to 20,459.48, 30,689.81 and 7,979.00 is: 11,968.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,459.48 : 30,689.81 = 7,979.00 : x
  2. Step 2: Convert to fraction form
    20,459.48/30,689.81 = 7,979.00/x
  3. Step 3: Cross multiply
    20,459.48x = 30,689.81 × 7,979.00
  4. Step 4: Simplify right side
    20,459.48x = 244,873,800.65
  5. Step 5: Solve for x
    x = 244,873,800.65/20,459.48
  6. Step 6: Final answer
    x = 11,968.72

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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.