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Finding the Fourth Proportional to 939.82, 1,410.06 and 419.77

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Solution

The fourth proportional to 939.82, 1,410.06 and 419.77 is: 629.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.82 : 1,410.06 = 419.77 : x
  2. Step 2: Convert to fraction form
    939.82/1,410.06 = 419.77/x
  3. Step 3: Cross multiply
    939.82x = 1,410.06 × 419.77
  4. Step 4: Simplify right side
    939.82x = 591,898.79
  5. Step 5: Solve for x
    x = 591,898.79/939.82
  6. Step 6: Final answer
    x = 629.80

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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.