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Finding the Fourth Proportional to 390.11, 585.27 and 205.02

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Solution

The fourth proportional to 390.11, 585.27 and 205.02 is: 307.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.11 : 585.27 = 205.02 : x
  2. Step 2: Convert to fraction form
    390.11/585.27 = 205.02/x
  3. Step 3: Cross multiply
    390.11x = 585.27 × 205.02
  4. Step 4: Simplify right side
    390.11x = 119,992.06
  5. Step 5: Solve for x
    x = 119,992.06/390.11
  6. Step 6: Final answer
    x = 307.59

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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.