Home / 21,254.90-31,881.12-8,108.60

Finding the Fourth Proportional to 21,254.90, 31,881.12 and 8,108.60

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Solution

The fourth proportional to 21,254.90, 31,881.12 and 8,108.60 is: 12,162.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,254.90 : 31,881.12 = 8,108.60 : x
  2. Step 2: Convert to fraction form
    21,254.90/31,881.12 = 8,108.60/x
  3. Step 3: Cross multiply
    21,254.90x = 31,881.12 × 8,108.60
  4. Step 4: Simplify right side
    21,254.90x = 258,511,249.63
  5. Step 5: Solve for x
    x = 258,511,249.63/21,254.90
  6. Step 6: Final answer
    x = 12,162.43

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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.