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Finding the Fourth Proportional to 18,919.91, 26,080.95 and 15,556.89

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Solution

The fourth proportional to 18,919.91, 26,080.95 and 15,556.89 is: 21,445.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.91 : 26,080.95 = 15,556.89 : x
  2. Step 2: Convert to fraction form
    18,919.91/26,080.95 = 15,556.89/x
  3. Step 3: Cross multiply
    18,919.91x = 26,080.95 × 15,556.89
  4. Step 4: Simplify right side
    18,919.91x = 405,738,626.39
  5. Step 5: Solve for x
    x = 405,738,626.39/18,919.91
  6. Step 6: Final answer
    x = 21,445.06

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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.