Home / 13,432.09-20,120.70-6,390.80

Finding the Fourth Proportional to 13,432.09, 20,120.70 and 6,390.80

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Solution

The fourth proportional to 13,432.09, 20,120.70 and 6,390.80 is: 9,573.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,432.09 : 20,120.70 = 6,390.80 : x
  2. Step 2: Convert to fraction form
    13,432.09/20,120.70 = 6,390.80/x
  3. Step 3: Cross multiply
    13,432.09x = 20,120.70 × 6,390.80
  4. Step 4: Simplify right side
    13,432.09x = 128,587,369.56
  5. Step 5: Solve for x
    x = 128,587,369.56/13,432.09
  6. Step 6: Final answer
    x = 9,573.15

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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.