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Finding the Fourth Proportional to 391,871.33, 587,905.74 and 111,388.58

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Solution

The fourth proportional to 391,871.33, 587,905.74 and 111,388.58 is: 167,110.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,871.33 : 587,905.74 = 111,388.58 : x
  2. Step 2: Convert to fraction form
    391,871.33/587,905.74 = 111,388.58/x
  3. Step 3: Cross multiply
    391,871.33x = 587,905.74 × 111,388.58
  4. Step 4: Simplify right side
    391,871.33x = 65,485,985,552.45
  5. Step 5: Solve for x
    x = 65,485,985,552.45/391,871.33
  6. Step 6: Final answer
    x = 167,110.94

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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.