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Finding the Fourth Proportional to 787.58, 1,086.79 and 455.94

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Solution

The fourth proportional to 787.58, 1,086.79 and 455.94 is: 629.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.58 : 1,086.79 = 455.94 : x
  2. Step 2: Convert to fraction form
    787.58/1,086.79 = 455.94/x
  3. Step 3: Cross multiply
    787.58x = 1,086.79 × 455.94
  4. Step 4: Simplify right side
    787.58x = 495,510.84
  5. Step 5: Solve for x
    x = 495,510.84/787.58
  6. Step 6: Final answer
    x = 629.16

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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.