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Finding the Fourth Proportional to 1,553.08, 2,143.15 and 889.78

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Solution

The fourth proportional to 1,553.08, 2,143.15 and 889.78 is: 1,227.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.08 : 2,143.15 = 889.78 : x
  2. Step 2: Convert to fraction form
    1,553.08/2,143.15 = 889.78/x
  3. Step 3: Cross multiply
    1,553.08x = 2,143.15 × 889.78
  4. Step 4: Simplify right side
    1,553.08x = 1,906,932.01
  5. Step 5: Solve for x
    x = 1,906,932.01/1,553.08
  6. Step 6: Final answer
    x = 1,227.84

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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.