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Finding the Fourth Proportional to 11,291.58, 15,590.16 and 8,634.36

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Solution

The fourth proportional to 11,291.58, 15,590.16 and 8,634.36 is: 11,921.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,291.58 : 15,590.16 = 8,634.36 : x
  2. Step 2: Convert to fraction form
    11,291.58/15,590.16 = 8,634.36/x
  3. Step 3: Cross multiply
    11,291.58x = 15,590.16 × 8,634.36
  4. Step 4: Simplify right side
    11,291.58x = 134,611,053.90
  5. Step 5: Solve for x
    x = 134,611,053.90/11,291.58
  6. Step 6: Final answer
    x = 11,921.37

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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.