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Finding the Fourth Proportional to 1,035.74, 1,553.70 and 419.78

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Solution

The fourth proportional to 1,035.74, 1,553.70 and 419.78 is: 629.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.74 : 1,553.70 = 419.78 : x
  2. Step 2: Convert to fraction form
    1,035.74/1,553.70 = 419.78/x
  3. Step 3: Cross multiply
    1,035.74x = 1,553.70 × 419.78
  4. Step 4: Simplify right side
    1,035.74x = 652,212.19
  5. Step 5: Solve for x
    x = 652,212.19/1,035.74
  6. Step 6: Final answer
    x = 629.71

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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.