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Finding the Fourth Proportional to 390.44, 585.75 and 195.55

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Solution

The fourth proportional to 390.44, 585.75 and 195.55 is: 293.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.44 : 585.75 = 195.55 : x
  2. Step 2: Convert to fraction form
    390.44/585.75 = 195.55/x
  3. Step 3: Cross multiply
    390.44x = 585.75 × 195.55
  4. Step 4: Simplify right side
    390.44x = 114,543.41
  5. Step 5: Solve for x
    x = 114,543.41/390.44
  6. Step 6: Final answer
    x = 293.37

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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.