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Finding the Fourth Proportional to 7,857.80, 10,843.90 and 4,321

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Solution

The fourth proportional to 7,857.80, 10,843.90 and 4,321 is: 5,963.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,857.80 : 10,843.90 = 4,321 : x
  2. Step 2: Convert to fraction form
    7,857.80/10,843.90 = 4,321/x
  3. Step 3: Cross multiply
    7,857.80x = 10,843.90 × 4,321
  4. Step 4: Simplify right side
    7,857.80x = 46,856,491.90
  5. Step 5: Solve for x
    x = 46,856,491.90/7,857.80
  6. Step 6: Final answer
    x = 5,963.05

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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.