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Finding the Fourth Proportional to 15,142.85, 20,899.11 and 9,174.62

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Solution

The fourth proportional to 15,142.85, 20,899.11 and 9,174.62 is: 12,662.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,142.85 : 20,899.11 = 9,174.62 : x
  2. Step 2: Convert to fraction form
    15,142.85/20,899.11 = 9,174.62/x
  3. Step 3: Cross multiply
    15,142.85x = 20,899.11 × 9,174.62
  4. Step 4: Simplify right side
    15,142.85x = 191,741,392.59
  5. Step 5: Solve for x
    x = 191,741,392.59/15,142.85
  6. Step 6: Final answer
    x = 12,662.17

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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.