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Finding the Fourth Proportional to 19,919.90, 27,489.90 and 10,967.58

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Solution

The fourth proportional to 19,919.90, 27,489.90 and 10,967.58 is: 15,135.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,919.90 : 27,489.90 = 10,967.58 : x
  2. Step 2: Convert to fraction form
    19,919.90/27,489.90 = 10,967.58/x
  3. Step 3: Cross multiply
    19,919.90x = 27,489.90 × 10,967.58
  4. Step 4: Simplify right side
    19,919.90x = 301,497,677.44
  5. Step 5: Solve for x
    x = 301,497,677.44/19,919.90
  6. Step 6: Final answer
    x = 15,135.50

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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.