Home / 13,420.52-18,517.34-8,115.23

Finding the Fourth Proportional to 13,420.52, 18,517.34 and 8,115.23

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Solution

The fourth proportional to 13,420.52, 18,517.34 and 8,115.23 is: 11,197.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.52 : 18,517.34 = 8,115.23 : x
  2. Step 2: Convert to fraction form
    13,420.52/18,517.34 = 8,115.23/x
  3. Step 3: Cross multiply
    13,420.52x = 18,517.34 × 8,115.23
  4. Step 4: Simplify right side
    13,420.52x = 150,272,339.93
  5. Step 5: Solve for x
    x = 150,272,339.93/13,420.52
  6. Step 6: Final answer
    x = 11,197.21

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Double scale
Find fourth proportional to 13,421.52, 18,518.71 and 8,116.23
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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.