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Finding the Fourth Proportional to 830.20, 1,245.22 and 505.48

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Solution

The fourth proportional to 830.20, 1,245.22 and 505.48 is: 758.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.20 : 1,245.22 = 505.48 : x
  2. Step 2: Convert to fraction form
    830.20/1,245.22 = 505.48/x
  3. Step 3: Cross multiply
    830.20x = 1,245.22 × 505.48
  4. Step 4: Simplify right side
    830.20x = 629,433.81
  5. Step 5: Solve for x
    x = 629,433.81/830.20
  6. Step 6: Final answer
    x = 758.17

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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.