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Finding the Fourth Proportional to 21,308.40, 29,404.12 and 11,876.40

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Solution

The fourth proportional to 21,308.40, 29,404.12 and 11,876.40 is: 16,388.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,308.40 : 29,404.12 = 11,876.40 : x
  2. Step 2: Convert to fraction form
    21,308.40/29,404.12 = 11,876.40/x
  3. Step 3: Cross multiply
    21,308.40x = 29,404.12 × 11,876.40
  4. Step 4: Simplify right side
    21,308.40x = 349,215,090.77
  5. Step 5: Solve for x
    x = 349,215,090.77/21,308.40
  6. Step 6: Final answer
    x = 16,388.61

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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.