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Finding the Fourth Proportional to 12,891.54, 17,791.04 and 7,228.11

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Solution

The fourth proportional to 12,891.54, 17,791.04 and 7,228.11 is: 9,975.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.54 : 17,791.04 = 7,228.11 : x
  2. Step 2: Convert to fraction form
    12,891.54/17,791.04 = 7,228.11/x
  3. Step 3: Cross multiply
    12,891.54x = 17,791.04 × 7,228.11
  4. Step 4: Simplify right side
    12,891.54x = 128,595,594.13
  5. Step 5: Solve for x
    x = 128,595,594.13/12,891.54
  6. Step 6: Final answer
    x = 9,975.19

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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.