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Finding the Fourth Proportional to 1,374.58, 1,896.64 and 785.31

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Solution

The fourth proportional to 1,374.58, 1,896.64 and 785.31 is: 1,083.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.58 : 1,896.64 = 785.31 : x
  2. Step 2: Convert to fraction form
    1,374.58/1,896.64 = 785.31/x
  3. Step 3: Cross multiply
    1,374.58x = 1,896.64 × 785.31
  4. Step 4: Simplify right side
    1,374.58x = 1,489,450.36
  5. Step 5: Solve for x
    x = 1,489,450.36/1,374.58
  6. Step 6: Final answer
    x = 1,083.57

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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.