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Finding the Fourth Proportional to 787.06, 1,086.12 and 455.60

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Solution

The fourth proportional to 787.06, 1,086.12 and 455.60 is: 628.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.06 : 1,086.12 = 455.60 : x
  2. Step 2: Convert to fraction form
    787.06/1,086.12 = 455.60/x
  3. Step 3: Cross multiply
    787.06x = 1,086.12 × 455.60
  4. Step 4: Simplify right side
    787.06x = 494,836.27
  5. Step 5: Solve for x
    x = 494,836.27/787.06
  6. Step 6: Final answer
    x = 628.71

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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.