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Finding the Fourth Proportional to 2,103.67, 3,155.85 and 787.88

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Solution

The fourth proportional to 2,103.67, 3,155.85 and 787.88 is: 1,181.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,103.67 : 3,155.85 = 787.88 : x
  2. Step 2: Convert to fraction form
    2,103.67/3,155.85 = 787.88/x
  3. Step 3: Cross multiply
    2,103.67x = 3,155.85 × 787.88
  4. Step 4: Simplify right side
    2,103.67x = 2,486,427.16
  5. Step 5: Solve for x
    x = 2,486,427.16/2,103.67
  6. Step 6: Final answer
    x = 1,181.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.