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Finding the Fourth Proportional to 15,171.64, 20,936.68 and 8,457.28

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Solution

The fourth proportional to 15,171.64, 20,936.68 and 8,457.28 is: 11,670.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,171.64 : 20,936.68 = 8,457.28 : x
  2. Step 2: Convert to fraction form
    15,171.64/20,936.68 = 8,457.28/x
  3. Step 3: Cross multiply
    15,171.64x = 20,936.68 × 8,457.28
  4. Step 4: Simplify right side
    15,171.64x = 177,067,291.55
  5. Step 5: Solve for x
    x = 177,067,291.55/15,171.64
  6. Step 6: Final answer
    x = 11,670.94

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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.