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Finding the Fourth Proportional to 589.60, 811.78 and 489.62

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Solution

The fourth proportional to 589.60, 811.78 and 489.62 is: 674.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.60 : 811.78 = 489.62 : x
  2. Step 2: Convert to fraction form
    589.60/811.78 = 489.62/x
  3. Step 3: Cross multiply
    589.60x = 811.78 × 489.62
  4. Step 4: Simplify right side
    589.60x = 397,463.72
  5. Step 5: Solve for x
    x = 397,463.72/589.60
  6. Step 6: Final answer
    x = 674.12

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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.