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Finding the Fourth Proportional to 13,556.90, 18,708.90 and 8,251.58

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Solution

The fourth proportional to 13,556.90, 18,708.90 and 8,251.58 is: 11,387.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,556.90 : 18,708.90 = 8,251.58 : x
  2. Step 2: Convert to fraction form
    13,556.90/18,708.90 = 8,251.58/x
  3. Step 3: Cross multiply
    13,556.90x = 18,708.90 × 8,251.58
  4. Step 4: Simplify right side
    13,556.90x = 154,377,985.06
  5. Step 5: Solve for x
    x = 154,377,985.06/13,556.90
  6. Step 6: Final answer
    x = 11,387.41

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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.