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Finding the Fourth Proportional to 1,914.65, 2,869.92 and 989.96

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Solution

The fourth proportional to 1,914.65, 2,869.92 and 989.96 is: 1,483.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,914.65 : 2,869.92 = 989.96 : x
  2. Step 2: Convert to fraction form
    1,914.65/2,869.92 = 989.96/x
  3. Step 3: Cross multiply
    1,914.65x = 2,869.92 × 989.96
  4. Step 4: Simplify right side
    1,914.65x = 2,841,091.65
  5. Step 5: Solve for x
    x = 2,841,091.65/1,914.65
  6. Step 6: Final answer
    x = 1,483.87

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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.