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Finding the Fourth Proportional to 13,420.70, 18,520.63 and 7,452.35

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Solution

The fourth proportional to 13,420.70, 18,520.63 and 7,452.35 is: 10,284.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.70 : 18,520.63 = 7,452.35 : x
  2. Step 2: Convert to fraction form
    13,420.70/18,520.63 = 7,452.35/x
  3. Step 3: Cross multiply
    13,420.70x = 18,520.63 × 7,452.35
  4. Step 4: Simplify right side
    13,420.70x = 138,022,244.65
  5. Step 5: Solve for x
    x = 138,022,244.65/13,420.70
  6. Step 6: Final answer
    x = 10,284.28

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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.