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Finding the Fourth Proportional to 785.09, 1,083.51 and 435.78

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Solution

The fourth proportional to 785.09, 1,083.51 and 435.78 is: 601.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.09 : 1,083.51 = 435.78 : x
  2. Step 2: Convert to fraction form
    785.09/1,083.51 = 435.78/x
  3. Step 3: Cross multiply
    785.09x = 1,083.51 × 435.78
  4. Step 4: Simplify right side
    785.09x = 472,171.99
  5. Step 5: Solve for x
    x = 472,171.99/785.09
  6. Step 6: Final answer
    x = 601.42

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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.