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Finding the Fourth Proportional to 830.76, 1,245 and 396.84

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Solution

The fourth proportional to 830.76, 1,245 and 396.84 is: 594.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.76 : 1,245 = 396.84 : x
  2. Step 2: Convert to fraction form
    830.76/1,245 = 396.84/x
  3. Step 3: Cross multiply
    830.76x = 1,245 × 396.84
  4. Step 4: Simplify right side
    830.76x = 494,065.80
  5. Step 5: Solve for x
    x = 494,065.80/830.76
  6. Step 6: Final answer
    x = 594.72

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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.