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Finding the Fourth Proportional to 1,639.69, 2,453.37 and 909.79

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Solution

The fourth proportional to 1,639.69, 2,453.37 and 909.79 is: 1,361.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.69 : 2,453.37 = 909.79 : x
  2. Step 2: Convert to fraction form
    1,639.69/2,453.37 = 909.79/x
  3. Step 3: Cross multiply
    1,639.69x = 2,453.37 × 909.79
  4. Step 4: Simplify right side
    1,639.69x = 2,232,051.49
  5. Step 5: Solve for x
    x = 2,232,051.49/1,639.69
  6. Step 6: Final answer
    x = 1,361.26

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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.