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Finding the Fourth Proportional to 1,553.21, 2,143.39 and 854.59

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Solution

The fourth proportional to 1,553.21, 2,143.39 and 854.59 is: 1,179.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.21 : 2,143.39 = 854.59 : x
  2. Step 2: Convert to fraction form
    1,553.21/2,143.39 = 854.59/x
  3. Step 3: Cross multiply
    1,553.21x = 2,143.39 × 854.59
  4. Step 4: Simplify right side
    1,553.21x = 1,831,719.66
  5. Step 5: Solve for x
    x = 1,831,719.66/1,553.21
  6. Step 6: Final answer
    x = 1,179.31

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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.