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Finding the Fourth Proportional to 806.21, 1,113.09 and 619.37

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Solution

The fourth proportional to 806.21, 1,113.09 and 619.37 is: 855.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.21 : 1,113.09 = 619.37 : x
  2. Step 2: Convert to fraction form
    806.21/1,113.09 = 619.37/x
  3. Step 3: Cross multiply
    806.21x = 1,113.09 × 619.37
  4. Step 4: Simplify right side
    806.21x = 689,408.99
  5. Step 5: Solve for x
    x = 689,408.99/806.21
  6. Step 6: Final answer
    x = 855.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.