Home / 21,180.71-31,771.29-6,389.76

Finding the Fourth Proportional to 21,180.71, 31,771.29 and 6,389.76

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Solution

The fourth proportional to 21,180.71, 31,771.29 and 6,389.76 is: 9,584.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,180.71 : 31,771.29 = 6,389.76 : x
  2. Step 2: Convert to fraction form
    21,180.71/31,771.29 = 6,389.76/x
  3. Step 3: Cross multiply
    21,180.71x = 31,771.29 × 6,389.76
  4. Step 4: Simplify right side
    21,180.71x = 203,010,759.13
  5. Step 5: Solve for x
    x = 203,010,759.13/21,180.71
  6. Step 6: Final answer
    x = 9,584.70

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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.