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Finding the Fourth Proportional to 18,979.41, 28,472.15 and 9,615.63

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Solution

The fourth proportional to 18,979.41, 28,472.15 and 9,615.63 is: 14,424.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.41 : 28,472.15 = 9,615.63 : x
  2. Step 2: Convert to fraction form
    18,979.41/28,472.15 = 9,615.63/x
  3. Step 3: Cross multiply
    18,979.41x = 28,472.15 × 9,615.63
  4. Step 4: Simplify right side
    18,979.41x = 273,777,659.70
  5. Step 5: Solve for x
    x = 273,777,659.70/18,979.41
  6. Step 6: Final answer
    x = 14,424.98

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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.