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Finding the Fourth Proportional to 489.19, 675.04 and 279.42

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Solution

The fourth proportional to 489.19, 675.04 and 279.42 is: 385.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.19 : 675.04 = 279.42 : x
  2. Step 2: Convert to fraction form
    489.19/675.04 = 279.42/x
  3. Step 3: Cross multiply
    489.19x = 675.04 × 279.42
  4. Step 4: Simplify right side
    489.19x = 188,619.68
  5. Step 5: Solve for x
    x = 188,619.68/489.19
  6. Step 6: Final answer
    x = 385.58

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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.