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Finding the Fourth Proportional to 1,489.20, 2,054.73 and 891.89

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Solution

The fourth proportional to 1,489.20, 2,054.73 and 891.89 is: 1,230.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.20 : 2,054.73 = 891.89 : x
  2. Step 2: Convert to fraction form
    1,489.20/2,054.73 = 891.89/x
  3. Step 3: Cross multiply
    1,489.20x = 2,054.73 × 891.89
  4. Step 4: Simplify right side
    1,489.20x = 1,832,593.14
  5. Step 5: Solve for x
    x = 1,832,593.14/1,489.20
  6. Step 6: Final answer
    x = 1,230.59

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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.