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Finding the Fourth Proportional to 15,791.60, 21,791.28 and 8,716.48

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Solution

The fourth proportional to 15,791.60, 21,791.28 and 8,716.48 is: 12,028.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,791.60 : 21,791.28 = 8,716.48 : x
  2. Step 2: Convert to fraction form
    15,791.60/21,791.28 = 8,716.48/x
  3. Step 3: Cross multiply
    15,791.60x = 21,791.28 × 8,716.48
  4. Step 4: Simplify right side
    15,791.60x = 189,943,256.29
  5. Step 5: Solve for x
    x = 189,943,256.29/15,791.60
  6. Step 6: Final answer
    x = 12,028.12

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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.