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Finding the Fourth Proportional to 830.86, 1,246.56 and 419.65

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Solution

The fourth proportional to 830.86, 1,246.56 and 419.65 is: 629.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.86 : 1,246.56 = 419.65 : x
  2. Step 2: Convert to fraction form
    830.86/1,246.56 = 419.65/x
  3. Step 3: Cross multiply
    830.86x = 1,246.56 × 419.65
  4. Step 4: Simplify right side
    830.86x = 523,118.90
  5. Step 5: Solve for x
    x = 523,118.90/830.86
  6. Step 6: Final answer
    x = 629.61

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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.