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Finding the Fourth Proportional to 45,221, 67,837.26 and 12,389

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Solution

The fourth proportional to 45,221, 67,837.26 and 12,389 is: 18,585.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,221 : 67,837.26 = 12,389 : x
  2. Step 2: Convert to fraction form
    45,221/67,837.26 = 12,389/x
  3. Step 3: Cross multiply
    45,221x = 67,837.26 × 12,389
  4. Step 4: Simplify right side
    45,221x = 840,435,814.14
  5. Step 5: Solve for x
    x = 840,435,814.14/45,221
  6. Step 6: Final answer
    x = 18,585.08

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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.