Home / 21,272.20-31,911.90-11,408.80

Finding the Fourth Proportional to 21,272.20, 31,911.90 and 11,408.80

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Solution

The fourth proportional to 21,272.20, 31,911.90 and 11,408.80 is: 17,115.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,272.20 : 31,911.90 = 11,408.80 : x
  2. Step 2: Convert to fraction form
    21,272.20/31,911.90 = 11,408.80/x
  3. Step 3: Cross multiply
    21,272.20x = 31,911.90 × 11,408.80
  4. Step 4: Simplify right side
    21,272.20x = 364,076,484.72
  5. Step 5: Solve for x
    x = 364,076,484.72/21,272.20
  6. Step 6: Final answer
    x = 17,115.13

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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.