Home / 21,279.09-31,917.47-6,486.77

Finding the Fourth Proportional to 21,279.09, 31,917.47 and 6,486.77

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Solution

The fourth proportional to 21,279.09, 31,917.47 and 6,486.77 is: 9,729.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.09 : 31,917.47 = 6,486.77 : x
  2. Step 2: Convert to fraction form
    21,279.09/31,917.47 = 6,486.77/x
  3. Step 3: Cross multiply
    21,279.09x = 31,917.47 × 6,486.77
  4. Step 4: Simplify right side
    21,279.09x = 207,041,094.85
  5. Step 5: Solve for x
    x = 207,041,094.85/21,279.09
  6. Step 6: Final answer
    x = 9,729.79

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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.