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Finding the Fourth Proportional to 787.04, 1,086.26 and 455.46

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Solution

The fourth proportional to 787.04, 1,086.26 and 455.46 is: 628.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.04 : 1,086.26 = 455.46 : x
  2. Step 2: Convert to fraction form
    787.04/1,086.26 = 455.46/x
  3. Step 3: Cross multiply
    787.04x = 1,086.26 × 455.46
  4. Step 4: Simplify right side
    787.04x = 494,747.98
  5. Step 5: Solve for x
    x = 494,747.98/787.04
  6. Step 6: Final answer
    x = 628.62

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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.