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Finding the Fourth Proportional to 390.95, 585.97 and 217.54

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Solution

The fourth proportional to 390.95, 585.97 and 217.54 is: 326.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.95 : 585.97 = 217.54 : x
  2. Step 2: Convert to fraction form
    390.95/585.97 = 217.54/x
  3. Step 3: Cross multiply
    390.95x = 585.97 × 217.54
  4. Step 4: Simplify right side
    390.95x = 127,470.99
  5. Step 5: Solve for x
    x = 127,470.99/390.95
  6. Step 6: Final answer
    x = 326.05

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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.