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Finding the Fourth Proportional to 489.07, 674.07 and 357.85

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Solution

The fourth proportional to 489.07, 674.07 and 357.85 is: 493.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.07 : 674.07 = 357.85 : x
  2. Step 2: Convert to fraction form
    489.07/674.07 = 357.85/x
  3. Step 3: Cross multiply
    489.07x = 674.07 × 357.85
  4. Step 4: Simplify right side
    489.07x = 241,212.58
  5. Step 5: Solve for x
    x = 241,212.58/489.07
  6. Step 6: Final answer
    x = 493.21

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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.