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Finding the Fourth Proportional to 881.35, 1,216.18 and 787.79

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Solution

The fourth proportional to 881.35, 1,216.18 and 787.79 is: 1,087.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.35 : 1,216.18 = 787.79 : x
  2. Step 2: Convert to fraction form
    881.35/1,216.18 = 787.79/x
  3. Step 3: Cross multiply
    881.35x = 1,216.18 × 787.79
  4. Step 4: Simplify right side
    881.35x = 958,094.44
  5. Step 5: Solve for x
    x = 958,094.44/881.35
  6. Step 6: Final answer
    x = 1,087.08

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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.