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Finding the Fourth Proportional to 778.30, 1,074.04 and 428.99

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Solution

The fourth proportional to 778.30, 1,074.04 and 428.99 is: 591.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.30 : 1,074.04 = 428.99 : x
  2. Step 2: Convert to fraction form
    778.30/1,074.04 = 428.99/x
  3. Step 3: Cross multiply
    778.30x = 1,074.04 × 428.99
  4. Step 4: Simplify right side
    778.30x = 460,745.98
  5. Step 5: Solve for x
    x = 460,745.98/778.30
  6. Step 6: Final answer
    x = 591.99

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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.