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Finding the Fourth Proportional to 1,375.72, 1,898.60 and 786.44

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Solution

The fourth proportional to 1,375.72, 1,898.60 and 786.44 is: 1,085.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.72 : 1,898.60 = 786.44 : x
  2. Step 2: Convert to fraction form
    1,375.72/1,898.60 = 786.44/x
  3. Step 3: Cross multiply
    1,375.72x = 1,898.60 × 786.44
  4. Step 4: Simplify right side
    1,375.72x = 1,493,134.98
  5. Step 5: Solve for x
    x = 1,493,134.98/1,375.72
  6. Step 6: Final answer
    x = 1,085.35

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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.