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Finding the Fourth Proportional to 15,122.66, 20,857.64 and 13,422.92

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Solution

The fourth proportional to 15,122.66, 20,857.64 and 13,422.92 is: 18,513.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,122.66 : 20,857.64 = 13,422.92 : x
  2. Step 2: Convert to fraction form
    15,122.66/20,857.64 = 13,422.92/x
  3. Step 3: Cross multiply
    15,122.66x = 20,857.64 × 13,422.92
  4. Step 4: Simplify right side
    15,122.66x = 279,970,433.11
  5. Step 5: Solve for x
    x = 279,970,433.11/15,122.66
  6. Step 6: Final answer
    x = 18,513.31

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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.