Home / 21,121.29-31,670.25-8,650.08

Finding the Fourth Proportional to 21,121.29, 31,670.25 and 8,650.08

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Solution

The fourth proportional to 21,121.29, 31,670.25 and 8,650.08 is: 12,970.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.29 : 31,670.25 = 8,650.08 : x
  2. Step 2: Convert to fraction form
    21,121.29/31,670.25 = 8,650.08/x
  3. Step 3: Cross multiply
    21,121.29x = 31,670.25 × 8,650.08
  4. Step 4: Simplify right side
    21,121.29x = 273,950,196.12
  5. Step 5: Solve for x
    x = 273,950,196.12/21,121.29
  6. Step 6: Final answer
    x = 12,970.33

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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.