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Finding the Fourth Proportional to 18,971.96, 28,434.90 and 13,426.94

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Solution

The fourth proportional to 18,971.96, 28,434.90 and 13,426.94 is: 20,124.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.96 : 28,434.90 = 13,426.94 : x
  2. Step 2: Convert to fraction form
    18,971.96/28,434.90 = 13,426.94/x
  3. Step 3: Cross multiply
    18,971.96x = 28,434.90 × 13,426.94
  4. Step 4: Simplify right side
    18,971.96x = 381,793,696.21
  5. Step 5: Solve for x
    x = 381,793,696.21/18,971.96
  6. Step 6: Final answer
    x = 20,124.10

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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.