Home / 12,408.72-17,128.44-8,218.32

Finding the Fourth Proportional to 12,408.72, 17,128.44 and 8,218.32

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Solution

The fourth proportional to 12,408.72, 17,128.44 and 8,218.32 is: 11,344.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,408.72 : 17,128.44 = 8,218.32 : x
  2. Step 2: Convert to fraction form
    12,408.72/17,128.44 = 8,218.32/x
  3. Step 3: Cross multiply
    12,408.72x = 17,128.44 × 8,218.32
  4. Step 4: Simplify right side
    12,408.72x = 140,767,001.02
  5. Step 5: Solve for x
    x = 140,767,001.02/12,408.72
  6. Step 6: Final answer
    x = 11,344.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.