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Finding the Fourth Proportional to 15,492, 21,379.44 and 8,868

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Solution

The fourth proportional to 15,492, 21,379.44 and 8,868 is: 12,238.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,492 : 21,379.44 = 8,868 : x
  2. Step 2: Convert to fraction form
    15,492/21,379.44 = 8,868/x
  3. Step 3: Cross multiply
    15,492x = 21,379.44 × 8,868
  4. Step 4: Simplify right side
    15,492x = 189,592,873.92
  5. Step 5: Solve for x
    x = 189,592,873.92/15,492
  6. Step 6: Final answer
    x = 12,238.11

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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.