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Finding the Fourth Proportional to 2,815.82, 3,885.86 and 1,556.90

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Solution

The fourth proportional to 2,815.82, 3,885.86 and 1,556.90 is: 2,148.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.82 : 3,885.86 = 1,556.90 : x
  2. Step 2: Convert to fraction form
    2,815.82/3,885.86 = 1,556.90/x
  3. Step 3: Cross multiply
    2,815.82x = 3,885.86 × 1,556.90
  4. Step 4: Simplify right side
    2,815.82x = 6,049,885.71
  5. Step 5: Solve for x
    x = 6,049,885.71/2,815.82
  6. Step 6: Final answer
    x = 2,148.53

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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.