Home / 21,216.25-31,824.36-5,421.31

Finding the Fourth Proportional to 21,216.25, 31,824.36 and 5,421.31

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Solution

The fourth proportional to 21,216.25, 31,824.36 and 5,421.31 is: 8,131.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,216.25 : 31,824.36 = 5,421.31 : x
  2. Step 2: Convert to fraction form
    21,216.25/31,824.36 = 5,421.31/x
  3. Step 3: Cross multiply
    21,216.25x = 31,824.36 × 5,421.31
  4. Step 4: Simplify right side
    21,216.25x = 172,529,721.11
  5. Step 5: Solve for x
    x = 172,529,721.11/21,216.25
  6. Step 6: Final answer
    x = 8,131.96

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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.