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Finding the Fourth Proportional to 3,261.09, 4,891.95 and 921.09

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Solution

The fourth proportional to 3,261.09, 4,891.95 and 921.09 is: 1,381.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,261.09 : 4,891.95 = 921.09 : x
  2. Step 2: Convert to fraction form
    3,261.09/4,891.95 = 921.09/x
  3. Step 3: Cross multiply
    3,261.09x = 4,891.95 × 921.09
  4. Step 4: Simplify right side
    3,261.09x = 4,505,926.23
  5. Step 5: Solve for x
    x = 4,505,926.23/3,261.09
  6. Step 6: Final answer
    x = 1,381.72

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1.5x scale

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.