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Finding the Fourth Proportional to 1,913.78, 2,873.30 and 989.97

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Solution

The fourth proportional to 1,913.78, 2,873.30 and 989.97 is: 1,486.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.78 : 2,873.30 = 989.97 : x
  2. Step 2: Convert to fraction form
    1,913.78/2,873.30 = 989.97/x
  3. Step 3: Cross multiply
    1,913.78x = 2,873.30 × 989.97
  4. Step 4: Simplify right side
    1,913.78x = 2,844,475.85
  5. Step 5: Solve for x
    x = 2,844,475.85/1,913.78
  6. Step 6: Final answer
    x = 1,486.32

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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.