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Finding the Fourth Proportional to 391,987.72, 587,840.49 and 135,750.90

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Solution

The fourth proportional to 391,987.72, 587,840.49 and 135,750.90 is: 203,577.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,987.72 : 587,840.49 = 135,750.90 : x
  2. Step 2: Convert to fraction form
    391,987.72/587,840.49 = 135,750.90/x
  3. Step 3: Cross multiply
    391,987.72x = 587,840.49 × 135,750.90
  4. Step 4: Simplify right side
    391,987.72x = 79,799,877,778.34
  5. Step 5: Solve for x
    x = 79,799,877,778.34/391,987.72
  6. Step 6: Final answer
    x = 203,577.49

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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.