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Finding the Fourth Proportional to 8,483.39, 12,721.40 and 2,640.45

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Solution

The fourth proportional to 8,483.39, 12,721.40 and 2,640.45 is: 3,959.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,483.39 : 12,721.40 = 2,640.45 : x
  2. Step 2: Convert to fraction form
    8,483.39/12,721.40 = 2,640.45/x
  3. Step 3: Cross multiply
    8,483.39x = 12,721.40 × 2,640.45
  4. Step 4: Simplify right side
    8,483.39x = 33,590,220.63
  5. Step 5: Solve for x
    x = 33,590,220.63/8,483.39
  6. Step 6: Final answer
    x = 3,959.53

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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.