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Finding the Fourth Proportional to 1,376.93, 1,900.49 and 787.81

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Solution

The fourth proportional to 1,376.93, 1,900.49 and 787.81 is: 1,087.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.93 : 1,900.49 = 787.81 : x
  2. Step 2: Convert to fraction form
    1,376.93/1,900.49 = 787.81/x
  3. Step 3: Cross multiply
    1,376.93x = 1,900.49 × 787.81
  4. Step 4: Simplify right side
    1,376.93x = 1,497,211.59
  5. Step 5: Solve for x
    x = 1,497,211.59/1,376.93
  6. Step 6: Final answer
    x = 1,087.36

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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.