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Finding the Fourth Proportional to 391,557.89, 587,170.74 and 138,901.97

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Solution

The fourth proportional to 391,557.89, 587,170.74 and 138,901.97 is: 208,294.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,557.89 : 587,170.74 = 138,901.97 : x
  2. Step 2: Convert to fraction form
    391,557.89/587,170.74 = 138,901.97/x
  3. Step 3: Cross multiply
    391,557.89x = 587,170.74 × 138,901.97
  4. Step 4: Simplify right side
    391,557.89x = 81,559,169,576.50
  5. Step 5: Solve for x
    x = 81,559,169,576.50/391,557.89
  6. Step 6: Final answer
    x = 208,294.03

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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.