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Finding the Fourth Proportional to 787.05, 1,086.21 and 455.46

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Solution

The fourth proportional to 787.05, 1,086.21 and 455.46 is: 628.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.05 : 1,086.21 = 455.46 : x
  2. Step 2: Convert to fraction form
    787.05/1,086.21 = 455.46/x
  3. Step 3: Cross multiply
    787.05x = 1,086.21 × 455.46
  4. Step 4: Simplify right side
    787.05x = 494,725.21
  5. Step 5: Solve for x
    x = 494,725.21/787.05
  6. Step 6: Final answer
    x = 628.58

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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.