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Finding the Fourth Proportional to 1,236.22, 1,854.62 and 871.72

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Solution

The fourth proportional to 1,236.22, 1,854.62 and 871.72 is: 1,307.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.22 : 1,854.62 = 871.72 : x
  2. Step 2: Convert to fraction form
    1,236.22/1,854.62 = 871.72/x
  3. Step 3: Cross multiply
    1,236.22x = 1,854.62 × 871.72
  4. Step 4: Simplify right side
    1,236.22x = 1,616,706.89
  5. Step 5: Solve for x
    x = 1,616,706.89/1,236.22
  6. Step 6: Final answer
    x = 1,307.79

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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.