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Finding the Fourth Proportional to 860,408.16, 1,289,449.68 and 327,638.64

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Solution

The fourth proportional to 860,408.16, 1,289,449.68 and 327,638.64 is: 491,015.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,408.16 : 1,289,449.68 = 327,638.64 : x
  2. Step 2: Convert to fraction form
    860,408.16/1,289,449.68 = 327,638.64/x
  3. Step 3: Cross multiply
    860,408.16x = 1,289,449.68 × 327,638.64
  4. Step 4: Simplify right side
    860,408.16x = 422,473,539,503.64
  5. Step 5: Solve for x
    x = 422,473,539,503.64/860,408.16
  6. Step 6: Final answer
    x = 491,015.26

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1.5x scale

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.