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Finding the Fourth Proportional to 390.80, 585.97 and 195.58

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Solution

The fourth proportional to 390.80, 585.97 and 195.58 is: 293.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.80 : 585.97 = 195.58 : x
  2. Step 2: Convert to fraction form
    390.80/585.97 = 195.58/x
  3. Step 3: Cross multiply
    390.80x = 585.97 × 195.58
  4. Step 4: Simplify right side
    390.80x = 114,602.30
  5. Step 5: Solve for x
    x = 114,602.30/390.80
  6. Step 6: Final answer
    x = 293.25

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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.