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Finding the Fourth Proportional to 787.14, 1,086.28 and 455.60

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Solution

The fourth proportional to 787.14, 1,086.28 and 455.60 is: 628.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.14 : 1,086.28 = 455.60 : x
  2. Step 2: Convert to fraction form
    787.14/1,086.28 = 455.60/x
  3. Step 3: Cross multiply
    787.14x = 1,086.28 × 455.60
  4. Step 4: Simplify right side
    787.14x = 494,910.74
  5. Step 5: Solve for x
    x = 494,910.74/787.14
  6. Step 6: Final answer
    x = 628.75

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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.