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Finding the Fourth Proportional to 2,978.90, 4,468.26 and 787.64

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Solution

The fourth proportional to 2,978.90, 4,468.26 and 787.64 is: 1,181.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,978.90 : 4,468.26 = 787.64 : x
  2. Step 2: Convert to fraction form
    2,978.90/4,468.26 = 787.64/x
  3. Step 3: Cross multiply
    2,978.90x = 4,468.26 × 787.64
  4. Step 4: Simplify right side
    2,978.90x = 3,519,380.31
  5. Step 5: Solve for x
    x = 3,519,380.31/2,978.90
  6. Step 6: Final answer
    x = 1,181.44

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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.