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Finding the Fourth Proportional to 2,556.90, 3,835.95 and 913.62

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Solution

The fourth proportional to 2,556.90, 3,835.95 and 913.62 is: 1,370.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,556.90 : 3,835.95 = 913.62 : x
  2. Step 2: Convert to fraction form
    2,556.90/3,835.95 = 913.62/x
  3. Step 3: Cross multiply
    2,556.90x = 3,835.95 × 913.62
  4. Step 4: Simplify right side
    2,556.90x = 3,504,600.64
  5. Step 5: Solve for x
    x = 3,504,600.64/2,556.90
  6. Step 6: Final answer
    x = 1,370.64

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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.