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Finding the Fourth Proportional to 518.99, 778.49 and 153.74

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Solution

The fourth proportional to 518.99, 778.49 and 153.74 is: 230.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.99 : 778.49 = 153.74 : x
  2. Step 2: Convert to fraction form
    518.99/778.49 = 153.74/x
  3. Step 3: Cross multiply
    518.99x = 778.49 × 153.74
  4. Step 4: Simplify right side
    518.99x = 119,687.67
  5. Step 5: Solve for x
    x = 119,687.67/518.99
  6. Step 6: Final answer
    x = 230.62

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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.