Home / 21,215.25-31,822.87-5,420.31

Finding the Fourth Proportional to 21,215.25, 31,822.87 and 5,420.31

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Solution

The fourth proportional to 21,215.25, 31,822.87 and 5,420.31 is: 8,130.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.25 : 31,822.87 = 5,420.31 : x
  2. Step 2: Convert to fraction form
    21,215.25/31,822.87 = 5,420.31/x
  3. Step 3: Cross multiply
    21,215.25x = 31,822.87 × 5,420.31
  4. Step 4: Simplify right side
    21,215.25x = 172,489,793.39
  5. Step 5: Solve for x
    x = 172,489,793.39/21,215.25
  6. Step 6: Final answer
    x = 8,130.46

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Similar ratio
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1.5x scale

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.