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Finding the Fourth Proportional to 12,487.20, 18,682.20 and 8,113.20

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Solution

The fourth proportional to 12,487.20, 18,682.20 and 8,113.20 is: 12,138.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.20 : 18,682.20 = 8,113.20 : x
  2. Step 2: Convert to fraction form
    12,487.20/18,682.20 = 8,113.20/x
  3. Step 3: Cross multiply
    12,487.20x = 18,682.20 × 8,113.20
  4. Step 4: Simplify right side
    12,487.20x = 151,572,425.04
  5. Step 5: Solve for x
    x = 151,572,425.04/12,487.20
  6. Step 6: Final answer
    x = 12,138.22

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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.