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Finding the Fourth Proportional to 258.32, 386.66 and 185.96

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Solution

The fourth proportional to 258.32, 386.66 and 185.96 is: 278.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.32 : 386.66 = 185.96 : x
  2. Step 2: Convert to fraction form
    258.32/386.66 = 185.96/x
  3. Step 3: Cross multiply
    258.32x = 386.66 × 185.96
  4. Step 4: Simplify right side
    258.32x = 71,903.29
  5. Step 5: Solve for x
    x = 71,903.29/258.32
  6. Step 6: Final answer
    x = 278.35

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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.