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Finding the Fourth Proportional to 8,085.78, 12,128.64 and 2,891.64

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Solution

The fourth proportional to 8,085.78, 12,128.64 and 2,891.64 is: 4,337.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,085.78 : 12,128.64 = 2,891.64 : x
  2. Step 2: Convert to fraction form
    8,085.78/12,128.64 = 2,891.64/x
  3. Step 3: Cross multiply
    8,085.78x = 12,128.64 × 2,891.64
  4. Step 4: Simplify right side
    8,085.78x = 35,071,660.57
  5. Step 5: Solve for x
    x = 35,071,660.57/8,085.78
  6. Step 6: Final answer
    x = 4,337.45

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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.