Home / 21,298.72-31,932.80-8,140

Finding the Fourth Proportional to 21,298.72, 31,932.80 and 8,140

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Solution

The fourth proportional to 21,298.72, 31,932.80 and 8,140 is: 12,204.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,298.72 : 31,932.80 = 8,140 : x
  2. Step 2: Convert to fraction form
    21,298.72/31,932.80 = 8,140/x
  3. Step 3: Cross multiply
    21,298.72x = 31,932.80 × 8,140
  4. Step 4: Simplify right side
    21,298.72x = 259,932,992
  5. Step 5: Solve for x
    x = 259,932,992/21,298.72
  6. Step 6: Final answer
    x = 12,204.16

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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.