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Finding the Fourth Proportional to 3,005.62, 4,507.91 and 813.84

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Solution

The fourth proportional to 3,005.62, 4,507.91 and 813.84 is: 1,220.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,005.62 : 4,507.91 = 813.84 : x
  2. Step 2: Convert to fraction form
    3,005.62/4,507.91 = 813.84/x
  3. Step 3: Cross multiply
    3,005.62x = 4,507.91 × 813.84
  4. Step 4: Simplify right side
    3,005.62x = 3,668,699.55
  5. Step 5: Solve for x
    x = 3,668,699.55/3,005.62
  6. Step 6: Final answer
    x = 1,220.61

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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.