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Finding the Fourth Proportional to 489.11, 674.75 and 391.01

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Solution

The fourth proportional to 489.11, 674.75 and 391.01 is: 539.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.11 : 674.75 = 391.01 : x
  2. Step 2: Convert to fraction form
    489.11/674.75 = 391.01/x
  3. Step 3: Cross multiply
    489.11x = 674.75 × 391.01
  4. Step 4: Simplify right side
    489.11x = 263,831.60
  5. Step 5: Solve for x
    x = 263,831.60/489.11
  6. Step 6: Final answer
    x = 539.42

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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.