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Finding the Fourth Proportional to 787.33, 1,086.49 and 438.01

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Solution

The fourth proportional to 787.33, 1,086.49 and 438.01 is: 604.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.33 : 1,086.49 = 438.01 : x
  2. Step 2: Convert to fraction form
    787.33/1,086.49 = 438.01/x
  3. Step 3: Cross multiply
    787.33x = 1,086.49 × 438.01
  4. Step 4: Simplify right side
    787.33x = 475,893.48
  5. Step 5: Solve for x
    x = 475,893.48/787.33
  6. Step 6: Final answer
    x = 604.44

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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.