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Finding the Fourth Proportional to 1,893.63, 2,840.81 and 661.39

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Solution

The fourth proportional to 1,893.63, 2,840.81 and 661.39 is: 992.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,893.63 : 2,840.81 = 661.39 : x
  2. Step 2: Convert to fraction form
    1,893.63/2,840.81 = 661.39/x
  3. Step 3: Cross multiply
    1,893.63x = 2,840.81 × 661.39
  4. Step 4: Simplify right side
    1,893.63x = 1,878,880.02
  5. Step 5: Solve for x
    x = 1,878,880.02/1,893.63
  6. Step 6: Final answer
    x = 992.21

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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.