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Finding the Fourth Proportional to 519, 778.40 and 153.79

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Solution

The fourth proportional to 519, 778.40 and 153.79 is: 230.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    519 : 778.40 = 153.79 : x
  2. Step 2: Convert to fraction form
    519/778.40 = 153.79/x
  3. Step 3: Cross multiply
    519x = 778.40 × 153.79
  4. Step 4: Simplify right side
    519x = 119,710.14
  5. Step 5: Solve for x
    x = 119,710.14/519
  6. Step 6: Final answer
    x = 230.66

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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.