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Finding the Fourth Proportional to 21,717.52, 29,970.12 and 11,781.52

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Solution

The fourth proportional to 21,717.52, 29,970.12 and 11,781.52 is: 16,258.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,717.52 : 29,970.12 = 11,781.52 : x
  2. Step 2: Convert to fraction form
    21,717.52/29,970.12 = 11,781.52/x
  3. Step 3: Cross multiply
    21,717.52x = 29,970.12 × 11,781.52
  4. Step 4: Simplify right side
    21,717.52x = 353,093,568.18
  5. Step 5: Solve for x
    x = 353,093,568.18/21,717.52
  6. Step 6: Final answer
    x = 16,258.47

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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.