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Finding the Fourth Proportional to 816.94, 1,218.83 and 787.06

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Solution

The fourth proportional to 816.94, 1,218.83 and 787.06 is: 1,174.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.94 : 1,218.83 = 787.06 : x
  2. Step 2: Convert to fraction form
    816.94/1,218.83 = 787.06/x
  3. Step 3: Cross multiply
    816.94x = 1,218.83 × 787.06
  4. Step 4: Simplify right side
    816.94x = 959,292.34
  5. Step 5: Solve for x
    x = 959,292.34/816.94
  6. Step 6: Final answer
    x = 1,174.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.