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Finding the Fourth Proportional to 519, 778.50 and 215

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Solution

The fourth proportional to 519, 778.50 and 215 is: 322.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    519 : 778.50 = 215 : x
  2. Step 2: Convert to fraction form
    519/778.50 = 215/x
  3. Step 3: Cross multiply
    519x = 778.50 × 215
  4. Step 4: Simplify right side
    519x = 167,377.50
  5. Step 5: Solve for x
    x = 167,377.50/519
  6. Step 6: Final answer
    x = 322.50

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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.