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Finding the Fourth Proportional to 28,107.81, 42,160.91 and 7,331.31

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Solution

The fourth proportional to 28,107.81, 42,160.91 and 7,331.31 is: 10,996.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,107.81 : 42,160.91 = 7,331.31 : x
  2. Step 2: Convert to fraction form
    28,107.81/42,160.91 = 7,331.31/x
  3. Step 3: Cross multiply
    28,107.81x = 42,160.91 × 7,331.31
  4. Step 4: Simplify right side
    28,107.81x = 309,094,664.44
  5. Step 5: Solve for x
    x = 309,094,664.44/28,107.81
  6. Step 6: Final answer
    x = 10,996.75

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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.