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Finding the Fourth Proportional to 390.07, 584.42 and 252.92

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Solution

The fourth proportional to 390.07, 584.42 and 252.92 is: 378.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.07 : 584.42 = 252.92 : x
  2. Step 2: Convert to fraction form
    390.07/584.42 = 252.92/x
  3. Step 3: Cross multiply
    390.07x = 584.42 × 252.92
  4. Step 4: Simplify right side
    390.07x = 147,811.70
  5. Step 5: Solve for x
    x = 147,811.70/390.07
  6. Step 6: Final answer
    x = 378.94

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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.