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Finding the Fourth Proportional to 1,643.96, 2,465.94 and 489.80

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Solution

The fourth proportional to 1,643.96, 2,465.94 and 489.80 is: 734.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.96 : 2,465.94 = 489.80 : x
  2. Step 2: Convert to fraction form
    1,643.96/2,465.94 = 489.80/x
  3. Step 3: Cross multiply
    1,643.96x = 2,465.94 × 489.80
  4. Step 4: Simplify right side
    1,643.96x = 1,207,805.08
  5. Step 5: Solve for x
    x = 1,207,805.08/1,643.96
  6. Step 6: Final answer
    x = 734.69

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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.