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Finding the Fourth Proportional to 829.98, 1,245.78 and 612.90

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Solution

The fourth proportional to 829.98, 1,245.78 and 612.90 is: 919.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.98 : 1,245.78 = 612.90 : x
  2. Step 2: Convert to fraction form
    829.98/1,245.78 = 612.90/x
  3. Step 3: Cross multiply
    829.98x = 1,245.78 × 612.90
  4. Step 4: Simplify right side
    829.98x = 763,538.56
  5. Step 5: Solve for x
    x = 763,538.56/829.98
  6. Step 6: Final answer
    x = 919.95

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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.