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Finding the Fourth Proportional to 12,487.20, 18,728.40 and 3,722.40

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Solution

The fourth proportional to 12,487.20, 18,728.40 and 3,722.40 is: 5,582.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.20 : 18,728.40 = 3,722.40 : x
  2. Step 2: Convert to fraction form
    12,487.20/18,728.40 = 3,722.40/x
  3. Step 3: Cross multiply
    12,487.20x = 18,728.40 × 3,722.40
  4. Step 4: Simplify right side
    12,487.20x = 69,714,596.16
  5. Step 5: Solve for x
    x = 69,714,596.16/12,487.20
  6. Step 6: Final answer
    x = 5,582.88

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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.