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Finding the Fourth Proportional to 830.76, 1,246.25 and 419.82

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Solution

The fourth proportional to 830.76, 1,246.25 and 419.82 is: 629.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.76 : 1,246.25 = 419.82 : x
  2. Step 2: Convert to fraction form
    830.76/1,246.25 = 419.82/x
  3. Step 3: Cross multiply
    830.76x = 1,246.25 × 419.82
  4. Step 4: Simplify right side
    830.76x = 523,200.68
  5. Step 5: Solve for x
    x = 523,200.68/830.76
  6. Step 6: Final answer
    x = 629.79

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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.