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Finding the Fourth Proportional to 787.37, 1,087.62 and 641.84

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Solution

The fourth proportional to 787.37, 1,087.62 and 641.84 is: 886.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.37 : 1,087.62 = 641.84 : x
  2. Step 2: Convert to fraction form
    787.37/1,087.62 = 641.84/x
  3. Step 3: Cross multiply
    787.37x = 1,087.62 × 641.84
  4. Step 4: Simplify right side
    787.37x = 698,078.02
  5. Step 5: Solve for x
    x = 698,078.02/787.37
  6. Step 6: Final answer
    x = 886.59

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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.