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Finding the Fourth Proportional to 390.85, 585.79 and 341.99

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Solution

The fourth proportional to 390.85, 585.79 and 341.99 is: 512.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.85 : 585.79 = 341.99 : x
  2. Step 2: Convert to fraction form
    390.85/585.79 = 341.99/x
  3. Step 3: Cross multiply
    390.85x = 585.79 × 341.99
  4. Step 4: Simplify right side
    390.85x = 200,329.68
  5. Step 5: Solve for x
    x = 200,329.68/390.85
  6. Step 6: Final answer
    x = 512.55

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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.