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Finding the Fourth Proportional to 1,375.74, 1,898.49 and 786.19

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Solution

The fourth proportional to 1,375.74, 1,898.49 and 786.19 is: 1,084.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.74 : 1,898.49 = 786.19 : x
  2. Step 2: Convert to fraction form
    1,375.74/1,898.49 = 786.19/x
  3. Step 3: Cross multiply
    1,375.74x = 1,898.49 × 786.19
  4. Step 4: Simplify right side
    1,375.74x = 1,492,573.85
  5. Step 5: Solve for x
    x = 1,492,573.85/1,375.74
  6. Step 6: Final answer
    x = 1,084.92

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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.