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Finding the Fourth Proportional to 390.38, 585.56 and 236.48

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Solution

The fourth proportional to 390.38, 585.56 and 236.48 is: 354.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.38 : 585.56 = 236.48 : x
  2. Step 2: Convert to fraction form
    390.38/585.56 = 236.48/x
  3. Step 3: Cross multiply
    390.38x = 585.56 × 236.48
  4. Step 4: Simplify right side
    390.38x = 138,470.89
  5. Step 5: Solve for x
    x = 138,470.89/390.38
  6. Step 6: Final answer
    x = 354.71

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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.