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Finding the Fourth Proportional to 390.54, 584.26 and 303.21

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Solution

The fourth proportional to 390.54, 584.26 and 303.21 is: 453.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.54 : 584.26 = 303.21 : x
  2. Step 2: Convert to fraction form
    390.54/584.26 = 303.21/x
  3. Step 3: Cross multiply
    390.54x = 584.26 × 303.21
  4. Step 4: Simplify right side
    390.54x = 177,154.42
  5. Step 5: Solve for x
    x = 177,154.42/390.54
  6. Step 6: Final answer
    x = 453.62

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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.