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Finding the Fourth Proportional to 521.00, 718.39 and 489.22

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Solution

The fourth proportional to 521.00, 718.39 and 489.22 is: 674.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.00 : 718.39 = 489.22 : x
  2. Step 2: Convert to fraction form
    521.00/718.39 = 489.22/x
  3. Step 3: Cross multiply
    521.00x = 718.39 × 489.22
  4. Step 4: Simplify right side
    521.00x = 351,450.86
  5. Step 5: Solve for x
    x = 351,450.86/521.00
  6. Step 6: Final answer
    x = 674.57

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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.