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Finding the Fourth Proportional to 128,611.68, 192,947.40 and 39,860.52

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Solution

The fourth proportional to 128,611.68, 192,947.40 and 39,860.52 is: 59,800.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.68 : 192,947.40 = 39,860.52 : x
  2. Step 2: Convert to fraction form
    128,611.68/192,947.40 = 39,860.52/x
  3. Step 3: Cross multiply
    128,611.68x = 192,947.40 × 39,860.52
  4. Step 4: Simplify right side
    128,611.68x = 7,690,983,696.65
  5. Step 5: Solve for x
    x = 7,690,983,696.65/128,611.68
  6. Step 6: Final answer
    x = 59,800.04

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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.