Home / 21,715.12-29,961.69-13,217.15

Finding the Fourth Proportional to 21,715.12, 29,961.69 and 13,217.15

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Solution

The fourth proportional to 21,715.12, 29,961.69 and 13,217.15 is: 18,236.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,715.12 : 29,961.69 = 13,217.15 : x
  2. Step 2: Convert to fraction form
    21,715.12/29,961.69 = 13,217.15/x
  3. Step 3: Cross multiply
    21,715.12x = 29,961.69 × 13,217.15
  4. Step 4: Simplify right side
    21,715.12x = 396,008,001.18
  5. Step 5: Solve for x
    x = 396,008,001.18/21,715.12
  6. Step 6: Final answer
    x = 18,236.51

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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.