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Finding the Fourth Proportional to 269,079.36, 403,421.39 and 128,936.40

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Solution

The fourth proportional to 269,079.36, 403,421.39 and 128,936.40 is: 193,309.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    269,079.36 : 403,421.39 = 128,936.40 : x
  2. Step 2: Convert to fraction form
    269,079.36/403,421.39 = 128,936.40/x
  3. Step 3: Cross multiply
    269,079.36x = 403,421.39 × 128,936.40
  4. Step 4: Simplify right side
    269,079.36x = 52,015,701,709.60
  5. Step 5: Solve for x
    x = 52,015,701,709.60/269,079.36
  6. Step 6: Final answer
    x = 193,309.89

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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.