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Finding the Fourth Proportional to 2,740.69, 3,781.79 and 1,621.69

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Solution

The fourth proportional to 2,740.69, 3,781.79 and 1,621.69 is: 2,237.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,740.69 : 3,781.79 = 1,621.69 : x
  2. Step 2: Convert to fraction form
    2,740.69/3,781.79 = 1,621.69/x
  3. Step 3: Cross multiply
    2,740.69x = 3,781.79 × 1,621.69
  4. Step 4: Simplify right side
    2,740.69x = 6,132,882.92
  5. Step 5: Solve for x
    x = 6,132,882.92/2,740.69
  6. Step 6: Final answer
    x = 2,237.71

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1.5x scale

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.