Home / 13,137.33-18,129.49-8,421.61

Finding the Fourth Proportional to 13,137.33, 18,129.49 and 8,421.61

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Solution

The fourth proportional to 13,137.33, 18,129.49 and 8,421.61 is: 11,621.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.33 : 18,129.49 = 8,421.61 : x
  2. Step 2: Convert to fraction form
    13,137.33/18,129.49 = 8,421.61/x
  3. Step 3: Cross multiply
    13,137.33x = 18,129.49 × 8,421.61
  4. Step 4: Simplify right side
    13,137.33x = 152,679,494.28
  5. Step 5: Solve for x
    x = 152,679,494.28/13,137.33
  6. Step 6: Final answer
    x = 11,621.81

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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.