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Finding the Fourth Proportional to 908.29, 1,362.78 and 518.05

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Solution

The fourth proportional to 908.29, 1,362.78 and 518.05 is: 777.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.29 : 1,362.78 = 518.05 : x
  2. Step 2: Convert to fraction form
    908.29/1,362.78 = 518.05/x
  3. Step 3: Cross multiply
    908.29x = 1,362.78 × 518.05
  4. Step 4: Simplify right side
    908.29x = 705,985.59
  5. Step 5: Solve for x
    x = 705,985.59/908.29
  6. Step 6: Final answer
    x = 777.27

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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.