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Finding the Fourth Proportional to 890,408.96, 1,335,768.96 and 391,760

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Solution

The fourth proportional to 890,408.96, 1,335,768.96 and 391,760 is: 587,708.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    890,408.96 : 1,335,768.96 = 391,760 : x
  2. Step 2: Convert to fraction form
    890,408.96/1,335,768.96 = 391,760/x
  3. Step 3: Cross multiply
    890,408.96x = 1,335,768.96 × 391,760
  4. Step 4: Simplify right side
    890,408.96x = 523,300,847,769.60
  5. Step 5: Solve for x
    x = 523,300,847,769.60/890,408.96
  6. Step 6: Final answer
    x = 587,708.43

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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.