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Finding the Fourth Proportional to 785.42, 1,083.78 and 436.04

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Solution

The fourth proportional to 785.42, 1,083.78 and 436.04 is: 601.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.42 : 1,083.78 = 436.04 : x
  2. Step 2: Convert to fraction form
    785.42/1,083.78 = 436.04/x
  3. Step 3: Cross multiply
    785.42x = 1,083.78 × 436.04
  4. Step 4: Simplify right side
    785.42x = 472,571.43
  5. Step 5: Solve for x
    x = 472,571.43/785.42
  6. Step 6: Final answer
    x = 601.68

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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.