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Finding the Fourth Proportional to 128,690.70, 192,970.22 and 53,790.40

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Solution

The fourth proportional to 128,690.70, 192,970.22 and 53,790.40 is: 80,658.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,690.70 : 192,970.22 = 53,790.40 : x
  2. Step 2: Convert to fraction form
    128,690.70/192,970.22 = 53,790.40/x
  3. Step 3: Cross multiply
    128,690.70x = 192,970.22 × 53,790.40
  4. Step 4: Simplify right side
    128,690.70x = 10,379,945,321.89
  5. Step 5: Solve for x
    x = 10,379,945,321.89/128,690.70
  6. Step 6: Final answer
    x = 80,658.08

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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.