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Finding the Fourth Proportional to 787.87, 1,087.23 and 456.27

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Solution

The fourth proportional to 787.87, 1,087.23 and 456.27 is: 629.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.87 : 1,087.23 = 456.27 : x
  2. Step 2: Convert to fraction form
    787.87/1,087.23 = 456.27/x
  3. Step 3: Cross multiply
    787.87x = 1,087.23 × 456.27
  4. Step 4: Simplify right side
    787.87x = 496,070.43
  5. Step 5: Solve for x
    x = 496,070.43/787.87
  6. Step 6: Final answer
    x = 629.63

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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.