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Finding the Fourth Proportional to 1,374.61, 1,896.91 and 785.03

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Solution

The fourth proportional to 1,374.61, 1,896.91 and 785.03 is: 1,083.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.61 : 1,896.91 = 785.03 : x
  2. Step 2: Convert to fraction form
    1,374.61/1,896.91 = 785.03/x
  3. Step 3: Cross multiply
    1,374.61x = 1,896.91 × 785.03
  4. Step 4: Simplify right side
    1,374.61x = 1,489,131.26
  5. Step 5: Solve for x
    x = 1,489,131.26/1,374.61
  6. Step 6: Final answer
    x = 1,083.31

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1.5x scale

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.