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Finding the Fourth Proportional to 128,111.80, 192,167.70 and 81,455.80

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Solution

The fourth proportional to 128,111.80, 192,167.70 and 81,455.80 is: 122,183.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,111.80 : 192,167.70 = 81,455.80 : x
  2. Step 2: Convert to fraction form
    128,111.80/192,167.70 = 81,455.80/x
  3. Step 3: Cross multiply
    128,111.80x = 192,167.70 × 81,455.80
  4. Step 4: Simplify right side
    128,111.80x = 15,653,173,737.66
  5. Step 5: Solve for x
    x = 15,653,173,737.66/128,111.80
  6. Step 6: Final answer
    x = 122,183.70

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1.5x scale

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.