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Finding the Fourth Proportional to 1,879.56, 2,818.80 and 646.65

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Solution

The fourth proportional to 1,879.56, 2,818.80 and 646.65 is: 969.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.56 : 2,818.80 = 646.65 : x
  2. Step 2: Convert to fraction form
    1,879.56/2,818.80 = 646.65/x
  3. Step 3: Cross multiply
    1,879.56x = 2,818.80 × 646.65
  4. Step 4: Simplify right side
    1,879.56x = 1,822,777.02
  5. Step 5: Solve for x
    x = 1,822,777.02/1,879.56
  6. Step 6: Final answer
    x = 969.79

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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.