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Finding the Fourth Proportional to 918.88, 1,268.94 and 787.12

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Solution

The fourth proportional to 918.88, 1,268.94 and 787.12 is: 1,086.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.88 : 1,268.94 = 787.12 : x
  2. Step 2: Convert to fraction form
    918.88/1,268.94 = 787.12/x
  3. Step 3: Cross multiply
    918.88x = 1,268.94 × 787.12
  4. Step 4: Simplify right side
    918.88x = 998,808.05
  5. Step 5: Solve for x
    x = 998,808.05/918.88
  6. Step 6: Final answer
    x = 1,086.98

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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.