Home / 21,181.20-31,750.20-12,411.60

Finding the Fourth Proportional to 21,181.20, 31,750.20 and 12,411.60

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Solution

The fourth proportional to 21,181.20, 31,750.20 and 12,411.60 is: 18,604.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,181.20 : 31,750.20 = 12,411.60 : x
  2. Step 2: Convert to fraction form
    21,181.20/31,750.20 = 12,411.60/x
  3. Step 3: Cross multiply
    21,181.20x = 31,750.20 × 12,411.60
  4. Step 4: Simplify right side
    21,181.20x = 394,070,782.32
  5. Step 5: Solve for x
    x = 394,070,782.32/21,181.20
  6. Step 6: Final answer
    x = 18,604.74

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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.