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Finding the Fourth Proportional to 1,036.35, 1,553.18 and 419.55

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Solution

The fourth proportional to 1,036.35, 1,553.18 and 419.55 is: 628.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.35 : 1,553.18 = 419.55 : x
  2. Step 2: Convert to fraction form
    1,036.35/1,553.18 = 419.55/x
  3. Step 3: Cross multiply
    1,036.35x = 1,553.18 × 419.55
  4. Step 4: Simplify right side
    1,036.35x = 651,634.57
  5. Step 5: Solve for x
    x = 651,634.57/1,036.35
  6. Step 6: Final answer
    x = 628.78

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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.