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Finding the Fourth Proportional to 18,967.96, 28,428.90 and 13,422.93

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Solution

The fourth proportional to 18,967.96, 28,428.90 and 13,422.93 is: 20,118.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,967.96 : 28,428.90 = 13,422.93 : x
  2. Step 2: Convert to fraction form
    18,967.96/28,428.90 = 13,422.93/x
  3. Step 3: Cross multiply
    18,967.96x = 28,428.90 × 13,422.93
  4. Step 4: Simplify right side
    18,967.96x = 381,599,134.68
  5. Step 5: Solve for x
    x = 381,599,134.68/18,967.96
  6. Step 6: Final answer
    x = 20,118.09

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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.