Home / 1,489.40-2,054.60-1,209.96

Finding the Fourth Proportional to 1,489.40, 2,054.60 and 1,209.96

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Solution

The fourth proportional to 1,489.40, 2,054.60 and 1,209.96 is: 1,669.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.40 : 2,054.60 = 1,209.96 : x
  2. Step 2: Convert to fraction form
    1,489.40/2,054.60 = 1,209.96/x
  3. Step 3: Cross multiply
    1,489.40x = 2,054.60 × 1,209.96
  4. Step 4: Simplify right side
    1,489.40x = 2,485,983.82
  5. Step 5: Solve for x
    x = 2,485,983.82/1,489.40
  6. Step 6: Final answer
    x = 1,669.12

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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.