Home / 21,012.21-31,508.60-12,249.63

Finding the Fourth Proportional to 21,012.21, 31,508.60 and 12,249.63

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Solution

The fourth proportional to 21,012.21, 31,508.60 and 12,249.63 is: 18,368.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.21 : 31,508.60 = 12,249.63 : x
  2. Step 2: Convert to fraction form
    21,012.21/31,508.60 = 12,249.63/x
  3. Step 3: Cross multiply
    21,012.21x = 31,508.60 × 12,249.63
  4. Step 4: Simplify right side
    21,012.21x = 385,968,630.57
  5. Step 5: Solve for x
    x = 385,968,630.57/21,012.21
  6. Step 6: Final answer
    x = 18,368.78

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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.