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Finding the Fourth Proportional to 2,740.86, 3,782.64 and 1,561.86

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Solution

The fourth proportional to 2,740.86, 3,782.64 and 1,561.86 is: 2,155.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,740.86 : 3,782.64 = 1,561.86 : x
  2. Step 2: Convert to fraction form
    2,740.86/3,782.64 = 1,561.86/x
  3. Step 3: Cross multiply
    2,740.86x = 3,782.64 × 1,561.86
  4. Step 4: Simplify right side
    2,740.86x = 5,907,954.11
  5. Step 5: Solve for x
    x = 5,907,954.11/2,740.86
  6. Step 6: Final answer
    x = 2,155.51

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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.