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Finding the Fourth Proportional to 785.44, 1,083.92 and 505.78

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Solution

The fourth proportional to 785.44, 1,083.92 and 505.78 is: 697.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.44 : 1,083.92 = 505.78 : x
  2. Step 2: Convert to fraction form
    785.44/1,083.92 = 505.78/x
  3. Step 3: Cross multiply
    785.44x = 1,083.92 × 505.78
  4. Step 4: Simplify right side
    785.44x = 548,225.06
  5. Step 5: Solve for x
    x = 548,225.06/785.44
  6. Step 6: Final answer
    x = 697.98

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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.