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Finding the Fourth Proportional to 391,425.40, 587,138.10 and 191,776.60

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Solution

The fourth proportional to 391,425.40, 587,138.10 and 191,776.60 is: 287,664.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,425.40 : 587,138.10 = 191,776.60 : x
  2. Step 2: Convert to fraction form
    391,425.40/587,138.10 = 191,776.60/x
  3. Step 3: Cross multiply
    391,425.40x = 587,138.10 × 191,776.60
  4. Step 4: Simplify right side
    391,425.40x = 112,599,348,548.46
  5. Step 5: Solve for x
    x = 112,599,348,548.46/391,425.40
  6. Step 6: Final answer
    x = 287,664.90

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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.