Home / 13,431.20-18,530.79-8,125.70

Finding the Fourth Proportional to 13,431.20, 18,530.79 and 8,125.70

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Solution

The fourth proportional to 13,431.20, 18,530.79 and 8,125.70 is: 11,210.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.20 : 18,530.79 = 8,125.70 : x
  2. Step 2: Convert to fraction form
    13,431.20/18,530.79 = 8,125.70/x
  3. Step 3: Cross multiply
    13,431.20x = 18,530.79 × 8,125.70
  4. Step 4: Simplify right side
    13,431.20x = 150,575,640.30
  5. Step 5: Solve for x
    x = 150,575,640.30/13,431.20
  6. Step 6: Final answer
    x = 11,210.89

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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.