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Finding the Fourth Proportional to 390.60, 585.15 and 236.61

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Solution

The fourth proportional to 390.60, 585.15 and 236.61 is: 354.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.60 : 585.15 = 236.61 : x
  2. Step 2: Convert to fraction form
    390.60/585.15 = 236.61/x
  3. Step 3: Cross multiply
    390.60x = 585.15 × 236.61
  4. Step 4: Simplify right side
    390.60x = 138,452.34
  5. Step 5: Solve for x
    x = 138,452.34/390.60
  6. Step 6: Final answer
    x = 354.46

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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.