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Finding the Fourth Proportional to 1,388.98, 2,083.80 and 739.58

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Solution

The fourth proportional to 1,388.98, 2,083.80 and 739.58 is: 1,109.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.98 : 2,083.80 = 739.58 : x
  2. Step 2: Convert to fraction form
    1,388.98/2,083.80 = 739.58/x
  3. Step 3: Cross multiply
    1,388.98x = 2,083.80 × 739.58
  4. Step 4: Simplify right side
    1,388.98x = 1,541,136.80
  5. Step 5: Solve for x
    x = 1,541,136.80/1,388.98
  6. Step 6: Final answer
    x = 1,109.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.