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Finding the Fourth Proportional to 489.02, 674.88 and 279.15

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Solution

The fourth proportional to 489.02, 674.88 and 279.15 is: 385.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.02 : 674.88 = 279.15 : x
  2. Step 2: Convert to fraction form
    489.02/674.88 = 279.15/x
  3. Step 3: Cross multiply
    489.02x = 674.88 × 279.15
  4. Step 4: Simplify right side
    489.02x = 188,390.74
  5. Step 5: Solve for x
    x = 188,390.74/489.02
  6. Step 6: Final answer
    x = 385.24

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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.