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Finding the Fourth Proportional to 489.56, 734.07 and 215.33

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Solution

The fourth proportional to 489.56, 734.07 and 215.33 is: 322.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.56 : 734.07 = 215.33 : x
  2. Step 2: Convert to fraction form
    489.56/734.07 = 215.33/x
  3. Step 3: Cross multiply
    489.56x = 734.07 × 215.33
  4. Step 4: Simplify right side
    489.56x = 158,067.29
  5. Step 5: Solve for x
    x = 158,067.29/489.56
  6. Step 6: Final answer
    x = 322.88

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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.