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Finding the Fourth Proportional to 13,420.80, 18,520.74 and 7,452.48

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Solution

The fourth proportional to 13,420.80, 18,520.74 and 7,452.48 is: 10,284.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.80 : 18,520.74 = 7,452.48 : x
  2. Step 2: Convert to fraction form
    13,420.80/18,520.74 = 7,452.48/x
  3. Step 3: Cross multiply
    13,420.80x = 18,520.74 × 7,452.48
  4. Step 4: Simplify right side
    13,420.80x = 138,025,444.44
  5. Step 5: Solve for x
    x = 138,025,444.44/13,420.80
  6. Step 6: Final answer
    x = 10,284.44

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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.