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Finding the Fourth Proportional to 1,208.44, 1,809.91 and 989.74

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Solution

The fourth proportional to 1,208.44, 1,809.91 and 989.74 is: 1,482.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.44 : 1,809.91 = 989.74 : x
  2. Step 2: Convert to fraction form
    1,208.44/1,809.91 = 989.74/x
  3. Step 3: Cross multiply
    1,208.44x = 1,809.91 × 989.74
  4. Step 4: Simplify right side
    1,208.44x = 1,791,333.64
  5. Step 5: Solve for x
    x = 1,791,333.64/1,208.44
  6. Step 6: Final answer
    x = 1,482.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.