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Finding the Fourth Proportional to 391,986.89, 587,924.98 and 125,712.81

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Solution

The fourth proportional to 391,986.89, 587,924.98 and 125,712.81 is: 188,551.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,986.89 : 587,924.98 = 125,712.81 : x
  2. Step 2: Convert to fraction form
    391,986.89/587,924.98 = 125,712.81/x
  3. Step 3: Cross multiply
    391,986.89x = 587,924.98 × 125,712.81
  4. Step 4: Simplify right side
    391,986.89x = 73,909,701,304.99
  5. Step 5: Solve for x
    x = 73,909,701,304.99/391,986.89
  6. Step 6: Final answer
    x = 188,551.46

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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.