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Finding the Fourth Proportional to 489.70, 675.79 and 268.66

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Solution

The fourth proportional to 489.70, 675.79 and 268.66 is: 370.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.70 : 675.79 = 268.66 : x
  2. Step 2: Convert to fraction form
    489.70/675.79 = 268.66/x
  3. Step 3: Cross multiply
    489.70x = 675.79 × 268.66
  4. Step 4: Simplify right side
    489.70x = 181,555.62
  5. Step 5: Solve for x
    x = 181,555.62/489.70
  6. Step 6: Final answer
    x = 370.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.