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Finding the Fourth Proportional to 1,036.62, 1,553.72 and 419.58

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Solution

The fourth proportional to 1,036.62, 1,553.72 and 419.58 is: 628.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.62 : 1,553.72 = 419.58 : x
  2. Step 2: Convert to fraction form
    1,036.62/1,553.72 = 419.58/x
  3. Step 3: Cross multiply
    1,036.62x = 1,553.72 × 419.58
  4. Step 4: Simplify right side
    1,036.62x = 651,907.74
  5. Step 5: Solve for x
    x = 651,907.74/1,036.62
  6. Step 6: Final answer
    x = 628.88

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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.