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Finding the Fourth Proportional to 1,721.61, 2,582.37 and 489.11

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Solution

The fourth proportional to 1,721.61, 2,582.37 and 489.11 is: 733.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.61 : 2,582.37 = 489.11 : x
  2. Step 2: Convert to fraction form
    1,721.61/2,582.37 = 489.11/x
  3. Step 3: Cross multiply
    1,721.61x = 2,582.37 × 489.11
  4. Step 4: Simplify right side
    1,721.61x = 1,263,050.08
  5. Step 5: Solve for x
    x = 1,263,050.08/1,721.61
  6. Step 6: Final answer
    x = 733.64

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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.