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Finding the Fourth Proportional to 1,879.68, 2,817.90 and 708.90

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Solution

The fourth proportional to 1,879.68, 2,817.90 and 708.90 is: 1,062.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.68 : 2,817.90 = 708.90 : x
  2. Step 2: Convert to fraction form
    1,879.68/2,817.90 = 708.90/x
  3. Step 3: Cross multiply
    1,879.68x = 2,817.90 × 708.90
  4. Step 4: Simplify right side
    1,879.68x = 1,997,609.31
  5. Step 5: Solve for x
    x = 1,997,609.31/1,879.68
  6. Step 6: Final answer
    x = 1,062.74

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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.