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Finding the Fourth Proportional to 128,608.51, 192,912.78 and 53,687.77

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Solution

The fourth proportional to 128,608.51, 192,912.78 and 53,687.77 is: 80,531.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,608.51 : 192,912.78 = 53,687.77 : x
  2. Step 2: Convert to fraction form
    128,608.51/192,912.78 = 53,687.77/x
  3. Step 3: Cross multiply
    128,608.51x = 192,912.78 × 53,687.77
  4. Step 4: Simplify right side
    128,608.51x = 10,357,056,962.70
  5. Step 5: Solve for x
    x = 10,357,056,962.70/128,608.51
  6. Step 6: Final answer
    x = 80,531.66

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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.