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Finding the Fourth Proportional to 128,291.90, 191,919.45 and 110,954.30

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Solution

The fourth proportional to 128,291.90, 191,919.45 and 110,954.30 is: 165,983.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,291.90 : 191,919.45 = 110,954.30 : x
  2. Step 2: Convert to fraction form
    128,291.90/191,919.45 = 110,954.30/x
  3. Step 3: Cross multiply
    128,291.90x = 191,919.45 × 110,954.30
  4. Step 4: Simplify right side
    128,291.90x = 21,294,288,231.14
  5. Step 5: Solve for x
    x = 21,294,288,231.14/128,291.90
  6. Step 6: Final answer
    x = 165,983.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.