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Finding the Fourth Proportional to 541.86, 812.79 and 419.78

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Solution

The fourth proportional to 541.86, 812.79 and 419.78 is: 629.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.86 : 812.79 = 419.78 : x
  2. Step 2: Convert to fraction form
    541.86/812.79 = 419.78/x
  3. Step 3: Cross multiply
    541.86x = 812.79 × 419.78
  4. Step 4: Simplify right side
    541.86x = 341,188.92
  5. Step 5: Solve for x
    x = 341,188.92/541.86
  6. Step 6: Final answer
    x = 629.66

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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.