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Finding the Fourth Proportional to 18,712.40, 28,049.40 and 10,917.20

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Solution

The fourth proportional to 18,712.40, 28,049.40 and 10,917.20 is: 16,364.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.40 : 28,049.40 = 10,917.20 : x
  2. Step 2: Convert to fraction form
    18,712.40/28,049.40 = 10,917.20/x
  3. Step 3: Cross multiply
    18,712.40x = 28,049.40 × 10,917.20
  4. Step 4: Simplify right side
    18,712.40x = 306,220,909.68
  5. Step 5: Solve for x
    x = 306,220,909.68/18,712.40
  6. Step 6: Final answer
    x = 16,364.60

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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.