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Finding the Fourth Proportional to 128,693.20, 192,886.20 and 53,813.20

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Solution

The fourth proportional to 128,693.20, 192,886.20 and 53,813.20 is: 80,655.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,693.20 : 192,886.20 = 53,813.20 : x
  2. Step 2: Convert to fraction form
    128,693.20/192,886.20 = 53,813.20/x
  3. Step 3: Cross multiply
    128,693.20x = 192,886.20 × 53,813.20
  4. Step 4: Simplify right side
    128,693.20x = 10,379,823,657.84
  5. Step 5: Solve for x
    x = 10,379,823,657.84/128,693.20
  6. Step 6: Final answer
    x = 80,655.57

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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.