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Finding the Fourth Proportional to 258.95, 387.89 and 194.06

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Solution

The fourth proportional to 258.95, 387.89 and 194.06 is: 290.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.95 : 387.89 = 194.06 : x
  2. Step 2: Convert to fraction form
    258.95/387.89 = 194.06/x
  3. Step 3: Cross multiply
    258.95x = 387.89 × 194.06
  4. Step 4: Simplify right side
    258.95x = 75,275.75
  5. Step 5: Solve for x
    x = 75,275.75/258.95
  6. Step 6: Final answer
    x = 290.69

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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.