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Finding the Fourth Proportional to 906.23, 1,359.80 and 419.63

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Solution

The fourth proportional to 906.23, 1,359.80 and 419.63 is: 629.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.23 : 1,359.80 = 419.63 : x
  2. Step 2: Convert to fraction form
    906.23/1,359.80 = 419.63/x
  3. Step 3: Cross multiply
    906.23x = 1,359.80 × 419.63
  4. Step 4: Simplify right side
    906.23x = 570,603.98
  5. Step 5: Solve for x
    x = 570,603.98/906.23
  6. Step 6: Final answer
    x = 629.65

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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.