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Finding the Fourth Proportional to 390.18, 585.20 and 195.12

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Solution

The fourth proportional to 390.18, 585.20 and 195.12 is: 292.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.18 : 585.20 = 195.12 : x
  2. Step 2: Convert to fraction form
    390.18/585.20 = 195.12/x
  3. Step 3: Cross multiply
    390.18x = 585.20 × 195.12
  4. Step 4: Simplify right side
    390.18x = 114,181.30
  5. Step 5: Solve for x
    x = 114,181.30/390.18
  6. Step 6: Final answer
    x = 292.64

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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.