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Finding the Fourth Proportional to 15,161.05, 20,913.82 and 8,872.21

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Solution

The fourth proportional to 15,161.05, 20,913.82 and 8,872.21 is: 12,238.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,161.05 : 20,913.82 = 8,872.21 : x
  2. Step 2: Convert to fraction form
    15,161.05/20,913.82 = 8,872.21/x
  3. Step 3: Cross multiply
    15,161.05x = 20,913.82 × 8,872.21
  4. Step 4: Simplify right side
    15,161.05x = 185,551,802.94
  5. Step 5: Solve for x
    x = 185,551,802.94/15,161.05
  6. Step 6: Final answer
    x = 12,238.72

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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.