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Finding the Fourth Proportional to 787.33, 1,084.12 and 621.01

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Solution

The fourth proportional to 787.33, 1,084.12 and 621.01 is: 855.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.33 : 1,084.12 = 621.01 : x
  2. Step 2: Convert to fraction form
    787.33/1,084.12 = 621.01/x
  3. Step 3: Cross multiply
    787.33x = 1,084.12 × 621.01
  4. Step 4: Simplify right side
    787.33x = 673,249.36
  5. Step 5: Solve for x
    x = 673,249.36/787.33
  6. Step 6: Final answer
    x = 855.10

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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.