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Finding the Fourth Proportional to 2,408.90, 3,612.72 and 764.60

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Solution

The fourth proportional to 2,408.90, 3,612.72 and 764.60 is: 1,146.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,408.90 : 3,612.72 = 764.60 : x
  2. Step 2: Convert to fraction form
    2,408.90/3,612.72 = 764.60/x
  3. Step 3: Cross multiply
    2,408.90x = 3,612.72 × 764.60
  4. Step 4: Simplify right side
    2,408.90x = 2,762,285.71
  5. Step 5: Solve for x
    x = 2,762,285.71/2,408.90
  6. Step 6: Final answer
    x = 1,146.70

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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.