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Finding the Fourth Proportional to 787.25, 1,179.51 and 416.51

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Solution

The fourth proportional to 787.25, 1,179.51 and 416.51 is: 624.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.25 : 1,179.51 = 416.51 : x
  2. Step 2: Convert to fraction form
    787.25/1,179.51 = 416.51/x
  3. Step 3: Cross multiply
    787.25x = 1,179.51 × 416.51
  4. Step 4: Simplify right side
    787.25x = 491,277.71
  5. Step 5: Solve for x
    x = 491,277.71/787.25
  6. Step 6: Final answer
    x = 624.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.