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Finding the Fourth Proportional to 20,130.29, 30,187.88 and 6,979.49

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Solution

The fourth proportional to 20,130.29, 30,187.88 and 6,979.49 is: 10,466.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.29 : 30,187.88 = 6,979.49 : x
  2. Step 2: Convert to fraction form
    20,130.29/30,187.88 = 6,979.49/x
  3. Step 3: Cross multiply
    20,130.29x = 30,187.88 × 6,979.49
  4. Step 4: Simplify right side
    20,130.29x = 210,695,971.68
  5. Step 5: Solve for x
    x = 210,695,971.68/20,130.29
  6. Step 6: Final answer
    x = 10,466.61

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1.5x scale

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.