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Finding the Fourth Proportional to 2,978.91, 4,467.85 and 787.66

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Solution

The fourth proportional to 2,978.91, 4,467.85 and 787.66 is: 1,181.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,978.91 : 4,467.85 = 787.66 : x
  2. Step 2: Convert to fraction form
    2,978.91/4,467.85 = 787.66/x
  3. Step 3: Cross multiply
    2,978.91x = 4,467.85 × 787.66
  4. Step 4: Simplify right side
    2,978.91x = 3,519,146.73
  5. Step 5: Solve for x
    x = 3,519,146.73/2,978.91
  6. Step 6: Final answer
    x = 1,181.35

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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.