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Finding the Fourth Proportional to 15,108.20, 20,847 and 8,393.72

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Solution

The fourth proportional to 15,108.20, 20,847 and 8,393.72 is: 11,582.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,108.20 : 20,847 = 8,393.72 : x
  2. Step 2: Convert to fraction form
    15,108.20/20,847 = 8,393.72/x
  3. Step 3: Cross multiply
    15,108.20x = 20,847 × 8,393.72
  4. Step 4: Simplify right side
    15,108.20x = 174,983,880.84
  5. Step 5: Solve for x
    x = 174,983,880.84/15,108.20
  6. Step 6: Final answer
    x = 11,582.05

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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.