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Finding the Fourth Proportional to 128,578.06, 192,897.88 and 53,656.53

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Solution

The fourth proportional to 128,578.06, 192,897.88 and 53,656.53 is: 80,497.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,578.06 : 192,897.88 = 53,656.53 : x
  2. Step 2: Convert to fraction form
    128,578.06/192,897.88 = 53,656.53/x
  3. Step 3: Cross multiply
    128,578.06x = 192,897.88 × 53,656.53
  4. Step 4: Simplify right side
    128,578.06x = 10,350,230,027.65
  5. Step 5: Solve for x
    x = 10,350,230,027.65/128,578.06
  6. Step 6: Final answer
    x = 80,497.64

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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.