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Finding the Fourth Proportional to 7,820, 10,791.60 and 4,508

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Solution

The fourth proportional to 7,820, 10,791.60 and 4,508 is: 6,221.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,820 : 10,791.60 = 4,508 : x
  2. Step 2: Convert to fraction form
    7,820/10,791.60 = 4,508/x
  3. Step 3: Cross multiply
    7,820x = 10,791.60 × 4,508
  4. Step 4: Simplify right side
    7,820x = 48,648,532.80
  5. Step 5: Solve for x
    x = 48,648,532.80/7,820
  6. Step 6: Final answer
    x = 6,221.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.