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Finding the Fourth Proportional to 613.10, 919.87 and 320.65

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Solution

The fourth proportional to 613.10, 919.87 and 320.65 is: 481.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.10 : 919.87 = 320.65 : x
  2. Step 2: Convert to fraction form
    613.10/919.87 = 320.65/x
  3. Step 3: Cross multiply
    613.10x = 919.87 × 320.65
  4. Step 4: Simplify right side
    613.10x = 294,953.21
  5. Step 5: Solve for x
    x = 294,953.21/613.10
  6. Step 6: Final answer
    x = 481.08

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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.