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Finding the Fourth Proportional to 1,611.45, 2,223.89 and 981.88

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Solution

The fourth proportional to 1,611.45, 2,223.89 and 981.88 is: 1,355.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.45 : 2,223.89 = 981.88 : x
  2. Step 2: Convert to fraction form
    1,611.45/2,223.89 = 981.88/x
  3. Step 3: Cross multiply
    1,611.45x = 2,223.89 × 981.88
  4. Step 4: Simplify right side
    1,611.45x = 2,183,593.11
  5. Step 5: Solve for x
    x = 2,183,593.11/1,611.45
  6. Step 6: Final answer
    x = 1,355.05

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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.