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Finding the Fourth Proportional to 1,879.91, 2,820.15 and 581.07

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Solution

The fourth proportional to 1,879.91, 2,820.15 and 581.07 is: 871.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,879.91 : 2,820.15 = 581.07 : x
  2. Step 2: Convert to fraction form
    1,879.91/2,820.15 = 581.07/x
  3. Step 3: Cross multiply
    1,879.91x = 2,820.15 × 581.07
  4. Step 4: Simplify right side
    1,879.91x = 1,638,704.56
  5. Step 5: Solve for x
    x = 1,638,704.56/1,879.91
  6. Step 6: Final answer
    x = 871.70

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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.