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Finding the Fourth Proportional to 7,871.67, 10,874.84 and 5,878.79

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Solution

The fourth proportional to 7,871.67, 10,874.84 and 5,878.79 is: 8,121.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,871.67 : 10,874.84 = 5,878.79 : x
  2. Step 2: Convert to fraction form
    7,871.67/10,874.84 = 5,878.79/x
  3. Step 3: Cross multiply
    7,871.67x = 10,874.84 × 5,878.79
  4. Step 4: Simplify right side
    7,871.67x = 63,930,900.64
  5. Step 5: Solve for x
    x = 63,930,900.64/7,871.67
  6. Step 6: Final answer
    x = 8,121.64

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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.