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Finding the Fourth Proportional to 7,878.34, 10,872.12 and 4,341.61

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Solution

The fourth proportional to 7,878.34, 10,872.12 and 4,341.61 is: 5,991.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,878.34 : 10,872.12 = 4,341.61 : x
  2. Step 2: Convert to fraction form
    7,878.34/10,872.12 = 4,341.61/x
  3. Step 3: Cross multiply
    7,878.34x = 10,872.12 × 4,341.61
  4. Step 4: Simplify right side
    7,878.34x = 47,202,504.91
  5. Step 5: Solve for x
    x = 47,202,504.91/7,878.34
  6. Step 6: Final answer
    x = 5,991.43

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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.