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Finding the Fourth Proportional to 128,834.10, 193,251.15 and 54,038.70

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Solution

The fourth proportional to 128,834.10, 193,251.15 and 54,038.70 is: 81,058.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,834.10 : 193,251.15 = 54,038.70 : x
  2. Step 2: Convert to fraction form
    128,834.10/193,251.15 = 54,038.70/x
  3. Step 3: Cross multiply
    128,834.10x = 193,251.15 × 54,038.70
  4. Step 4: Simplify right side
    128,834.10x = 10,443,040,919.51
  5. Step 5: Solve for x
    x = 10,443,040,919.51/128,834.10
  6. Step 6: Final answer
    x = 81,058.05

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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.