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Finding the Fourth Proportional to 1,489.03, 2,054.63 and 891.34

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Solution

The fourth proportional to 1,489.03, 2,054.63 and 891.34 is: 1,229.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.03 : 2,054.63 = 891.34 : x
  2. Step 2: Convert to fraction form
    1,489.03/2,054.63 = 891.34/x
  3. Step 3: Cross multiply
    1,489.03x = 2,054.63 × 891.34
  4. Step 4: Simplify right side
    1,489.03x = 1,831,371.00
  5. Step 5: Solve for x
    x = 1,831,371.00/1,489.03
  6. Step 6: Final answer
    x = 1,229.91

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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.