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Finding the Fourth Proportional to 787.43, 1,181.07 and 479.21

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Solution

The fourth proportional to 787.43, 1,181.07 and 479.21 is: 718.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.43 : 1,181.07 = 479.21 : x
  2. Step 2: Convert to fraction form
    787.43/1,181.07 = 479.21/x
  3. Step 3: Cross multiply
    787.43x = 1,181.07 × 479.21
  4. Step 4: Simplify right side
    787.43x = 565,974.65
  5. Step 5: Solve for x
    x = 565,974.65/787.43
  6. Step 6: Final answer
    x = 718.77

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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.