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Finding the Fourth Proportional to 21,357.92, 29,479.20 and 12,981.44

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Solution

The fourth proportional to 21,357.92, 29,479.20 and 12,981.44 is: 17,917.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,357.92 : 29,479.20 = 12,981.44 : x
  2. Step 2: Convert to fraction form
    21,357.92/29,479.20 = 12,981.44/x
  3. Step 3: Cross multiply
    21,357.92x = 29,479.20 × 12,981.44
  4. Step 4: Simplify right side
    21,357.92x = 382,682,466.05
  5. Step 5: Solve for x
    x = 382,682,466.05/21,357.92
  6. Step 6: Final answer
    x = 17,917.59

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1.5x scale

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.