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Finding the Fourth Proportional to 961.37, 1,439.69 and 613.68

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Solution

The fourth proportional to 961.37, 1,439.69 and 613.68 is: 919.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.37 : 1,439.69 = 613.68 : x
  2. Step 2: Convert to fraction form
    961.37/1,439.69 = 613.68/x
  3. Step 3: Cross multiply
    961.37x = 1,439.69 × 613.68
  4. Step 4: Simplify right side
    961.37x = 883,508.96
  5. Step 5: Solve for x
    x = 883,508.96/961.37
  6. Step 6: Final answer
    x = 919.01

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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.