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Finding the Fourth Proportional to 140,415.61, 193,750.89 and 79,987.43

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Solution

The fourth proportional to 140,415.61, 193,750.89 and 79,987.43 is: 110,369.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,415.61 : 193,750.89 = 79,987.43 : x
  2. Step 2: Convert to fraction form
    140,415.61/193,750.89 = 79,987.43/x
  3. Step 3: Cross multiply
    140,415.61x = 193,750.89 × 79,987.43
  4. Step 4: Simplify right side
    140,415.61x = 15,497,635,751.31
  5. Step 5: Solve for x
    x = 15,497,635,751.31/140,415.61
  6. Step 6: Final answer
    x = 110,369.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.