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Finding the Fourth Proportional to 8,478.51, 12,721.55 and 3,284.79

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Solution

The fourth proportional to 8,478.51, 12,721.55 and 3,284.79 is: 4,928.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,478.51 : 12,721.55 = 3,284.79 : x
  2. Step 2: Convert to fraction form
    8,478.51/12,721.55 = 3,284.79/x
  3. Step 3: Cross multiply
    8,478.51x = 12,721.55 × 3,284.79
  4. Step 4: Simplify right side
    8,478.51x = 41,787,603.80
  5. Step 5: Solve for x
    x = 41,787,603.80/8,478.51
  6. Step 6: Final answer
    x = 4,928.65

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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.