Home / 21,199.11-31,788-8,715.66

Finding the Fourth Proportional to 21,199.11, 31,788 and 8,715.66

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Solution

The fourth proportional to 21,199.11, 31,788 and 8,715.66 is: 13,069.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,199.11 : 31,788 = 8,715.66 : x
  2. Step 2: Convert to fraction form
    21,199.11/31,788 = 8,715.66/x
  3. Step 3: Cross multiply
    21,199.11x = 31,788 × 8,715.66
  4. Step 4: Simplify right side
    21,199.11x = 277,053,400.08
  5. Step 5: Solve for x
    x = 277,053,400.08/21,199.11
  6. Step 6: Final answer
    x = 13,069.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.