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Finding the Fourth Proportional to 1,879.21, 2,818.86 and 646.68

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Solution

The fourth proportional to 1,879.21, 2,818.86 and 646.68 is: 970.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.21 : 2,818.86 = 646.68 : x
  2. Step 2: Convert to fraction form
    1,879.21/2,818.86 = 646.68/x
  3. Step 3: Cross multiply
    1,879.21x = 2,818.86 × 646.68
  4. Step 4: Simplify right side
    1,879.21x = 1,822,897.15
  5. Step 5: Solve for x
    x = 1,822,897.15/1,879.21
  6. Step 6: Final answer
    x = 970.04

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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.