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Finding the Fourth Proportional to 380.25, 570.39 and 321.93

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Solution

The fourth proportional to 380.25, 570.39 and 321.93 is: 482.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.25 : 570.39 = 321.93 : x
  2. Step 2: Convert to fraction form
    380.25/570.39 = 321.93/x
  3. Step 3: Cross multiply
    380.25x = 570.39 × 321.93
  4. Step 4: Simplify right side
    380.25x = 183,625.65
  5. Step 5: Solve for x
    x = 183,625.65/380.25
  6. Step 6: Final answer
    x = 482.91

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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.