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Finding the Fourth Proportional to 1,377.20, 1,900.55 and 787.75

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Solution

The fourth proportional to 1,377.20, 1,900.55 and 787.75 is: 1,087.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.20 : 1,900.55 = 787.75 : x
  2. Step 2: Convert to fraction form
    1,377.20/1,900.55 = 787.75/x
  3. Step 3: Cross multiply
    1,377.20x = 1,900.55 × 787.75
  4. Step 4: Simplify right side
    1,377.20x = 1,497,155.48
  5. Step 5: Solve for x
    x = 1,497,155.48/1,377.20
  6. Step 6: Final answer
    x = 1,087.10

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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.