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Finding the Fourth Proportional to 1,879.05, 2,817.89 and 646.11

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Solution

The fourth proportional to 1,879.05, 2,817.89 and 646.11 is: 968.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.05 : 2,817.89 = 646.11 : x
  2. Step 2: Convert to fraction form
    1,879.05/2,817.89 = 646.11/x
  3. Step 3: Cross multiply
    1,879.05x = 2,817.89 × 646.11
  4. Step 4: Simplify right side
    1,879.05x = 1,820,663.68
  5. Step 5: Solve for x
    x = 1,820,663.68/1,879.05
  6. Step 6: Final answer
    x = 968.93

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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.