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Finding the Fourth Proportional to 1,376.86, 1,900.09 and 787.40

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Solution

The fourth proportional to 1,376.86, 1,900.09 and 787.40 is: 1,086.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.86 : 1,900.09 = 787.40 : x
  2. Step 2: Convert to fraction form
    1,376.86/1,900.09 = 787.40/x
  3. Step 3: Cross multiply
    1,376.86x = 1,900.09 × 787.40
  4. Step 4: Simplify right side
    1,376.86x = 1,496,130.87
  5. Step 5: Solve for x
    x = 1,496,130.87/1,376.86
  6. Step 6: Final answer
    x = 1,086.63

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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.