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Finding the Fourth Proportional to 258.96, 387.34 and 189.70

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Solution

The fourth proportional to 258.96, 387.34 and 189.70 is: 283.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.96 : 387.34 = 189.70 : x
  2. Step 2: Convert to fraction form
    258.96/387.34 = 189.70/x
  3. Step 3: Cross multiply
    258.96x = 387.34 × 189.70
  4. Step 4: Simplify right side
    258.96x = 73,478.40
  5. Step 5: Solve for x
    x = 73,478.40/258.96
  6. Step 6: Final answer
    x = 283.74

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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.