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Finding the Fourth Proportional to 613.53, 919.48 and 288.21

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Solution

The fourth proportional to 613.53, 919.48 and 288.21 is: 431.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.53 : 919.48 = 288.21 : x
  2. Step 2: Convert to fraction form
    613.53/919.48 = 288.21/x
  3. Step 3: Cross multiply
    613.53x = 919.48 × 288.21
  4. Step 4: Simplify right side
    613.53x = 265,003.33
  5. Step 5: Solve for x
    x = 265,003.33/613.53
  6. Step 6: Final answer
    x = 431.93

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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.