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Finding the Fourth Proportional to 1,639.08, 2,261.94 and 930.84

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Solution

The fourth proportional to 1,639.08, 2,261.94 and 930.84 is: 1,284.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.08 : 2,261.94 = 930.84 : x
  2. Step 2: Convert to fraction form
    1,639.08/2,261.94 = 930.84/x
  3. Step 3: Cross multiply
    1,639.08x = 2,261.94 × 930.84
  4. Step 4: Simplify right side
    1,639.08x = 2,105,504.23
  5. Step 5: Solve for x
    x = 2,105,504.23/1,639.08
  6. Step 6: Final answer
    x = 1,284.56

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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.