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Finding the Fourth Proportional to 2,891.05, 3,989.79 and 1,772.05

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Solution

The fourth proportional to 2,891.05, 3,989.79 and 1,772.05 is: 2,445.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.05 : 3,989.79 = 1,772.05 : x
  2. Step 2: Convert to fraction form
    2,891.05/3,989.79 = 1,772.05/x
  3. Step 3: Cross multiply
    2,891.05x = 3,989.79 × 1,772.05
  4. Step 4: Simplify right side
    2,891.05x = 7,070,107.37
  5. Step 5: Solve for x
    x = 7,070,107.37/2,891.05
  6. Step 6: Final answer
    x = 2,445.52

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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.