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Finding the Fourth Proportional to 1,376.96, 1,900 and 817.44

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Solution

The fourth proportional to 1,376.96, 1,900 and 817.44 is: 1,127.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.96 : 1,900 = 817.44 : x
  2. Step 2: Convert to fraction form
    1,376.96/1,900 = 817.44/x
  3. Step 3: Cross multiply
    1,376.96x = 1,900 × 817.44
  4. Step 4: Simplify right side
    1,376.96x = 1,553,136
  5. Step 5: Solve for x
    x = 1,553,136/1,376.96
  6. Step 6: Final answer
    x = 1,127.95

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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.