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Finding the Fourth Proportional to 30,418.76, 41,979.53 and 16,990.31

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Solution

The fourth proportional to 30,418.76, 41,979.53 and 16,990.31 is: 23,447.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,418.76 : 41,979.53 = 16,990.31 : x
  2. Step 2: Convert to fraction form
    30,418.76/41,979.53 = 16,990.31/x
  3. Step 3: Cross multiply
    30,418.76x = 41,979.53 × 16,990.31
  4. Step 4: Simplify right side
    30,418.76x = 713,245,375.78
  5. Step 5: Solve for x
    x = 713,245,375.78/30,418.76
  6. Step 6: Final answer
    x = 23,447.55

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1.5x scale

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.