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Finding the Fourth Proportional to 21,388.71, 29,518.02 and 11,956.71

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Solution

The fourth proportional to 21,388.71, 29,518.02 and 11,956.71 is: 16,501.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,388.71 : 29,518.02 = 11,956.71 : x
  2. Step 2: Convert to fraction form
    21,388.71/29,518.02 = 11,956.71/x
  3. Step 3: Cross multiply
    21,388.71x = 29,518.02 × 11,956.71
  4. Step 4: Simplify right side
    21,388.71x = 352,938,404.91
  5. Step 5: Solve for x
    x = 352,938,404.91/21,388.71
  6. Step 6: Final answer
    x = 16,501.15

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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.