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Finding the Fourth Proportional to 505.98, 756 and 408.78

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Solution

The fourth proportional to 505.98, 756 and 408.78 is: 610.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.98 : 756 = 408.78 : x
  2. Step 2: Convert to fraction form
    505.98/756 = 408.78/x
  3. Step 3: Cross multiply
    505.98x = 756 × 408.78
  4. Step 4: Simplify right side
    505.98x = 309,037.68
  5. Step 5: Solve for x
    x = 309,037.68/505.98
  6. Step 6: Final answer
    x = 610.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.