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Finding the Fourth Proportional to 128,909.80, 193,342.38 and 35,393.68

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Solution

The fourth proportional to 128,909.80, 193,342.38 and 35,393.68 is: 53,084.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,909.80 : 193,342.38 = 35,393.68 : x
  2. Step 2: Convert to fraction form
    128,909.80/193,342.38 = 35,393.68/x
  3. Step 3: Cross multiply
    128,909.80x = 193,342.38 × 35,393.68
  4. Step 4: Simplify right side
    128,909.80x = 6,843,098,328.16
  5. Step 5: Solve for x
    x = 6,843,098,328.16/128,909.80
  6. Step 6: Final answer
    x = 53,084.39

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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.