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Finding the Fourth Proportional to 1,721.77, 2,582.79 and 489.21

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Solution

The fourth proportional to 1,721.77, 2,582.79 and 489.21 is: 733.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.77 : 2,582.79 = 489.21 : x
  2. Step 2: Convert to fraction form
    1,721.77/2,582.79 = 489.21/x
  3. Step 3: Cross multiply
    1,721.77x = 2,582.79 × 489.21
  4. Step 4: Simplify right side
    1,721.77x = 1,263,526.70
  5. Step 5: Solve for x
    x = 1,263,526.70/1,721.77
  6. Step 6: Final answer
    x = 733.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.