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Finding the Fourth Proportional to 390.96, 585.84 and 228.96

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Solution

The fourth proportional to 390.96, 585.84 and 228.96 is: 343.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.96 : 585.84 = 228.96 : x
  2. Step 2: Convert to fraction form
    390.96/585.84 = 228.96/x
  3. Step 3: Cross multiply
    390.96x = 585.84 × 228.96
  4. Step 4: Simplify right side
    390.96x = 134,133.93
  5. Step 5: Solve for x
    x = 134,133.93/390.96
  6. Step 6: Final answer
    x = 343.09

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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.