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Finding the Fourth Proportional to 3,211.51, 4,817.59 and 871.55

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Solution

The fourth proportional to 3,211.51, 4,817.59 and 871.55 is: 1,307.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,211.51 : 4,817.59 = 871.55 : x
  2. Step 2: Convert to fraction form
    3,211.51/4,817.59 = 871.55/x
  3. Step 3: Cross multiply
    3,211.51x = 4,817.59 × 871.55
  4. Step 4: Simplify right side
    3,211.51x = 4,198,780.43
  5. Step 5: Solve for x
    x = 4,198,780.43/3,211.51
  6. Step 6: Final answer
    x = 1,307.42

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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.