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Finding the Fourth Proportional to 128,578.55, 192,898.62 and 53,657.02

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Solution

The fourth proportional to 128,578.55, 192,898.62 and 53,657.02 is: 80,498.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,578.55 : 192,898.62 = 53,657.02 : x
  2. Step 2: Convert to fraction form
    128,578.55/192,898.62 = 53,657.02/x
  3. Step 3: Cross multiply
    128,578.55x = 192,898.62 × 53,657.02
  4. Step 4: Simplify right side
    128,578.55x = 10,350,365,111.31
  5. Step 5: Solve for x
    x = 10,350,365,111.31/128,578.55
  6. Step 6: Final answer
    x = 80,498.38

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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.