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Finding the Fourth Proportional to 1,639.68, 2,456.25 and 774.60

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Solution

The fourth proportional to 1,639.68, 2,456.25 and 774.60 is: 1,160.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.68 : 2,456.25 = 774.60 : x
  2. Step 2: Convert to fraction form
    1,639.68/2,456.25 = 774.60/x
  3. Step 3: Cross multiply
    1,639.68x = 2,456.25 × 774.60
  4. Step 4: Simplify right side
    1,639.68x = 1,902,611.25
  5. Step 5: Solve for x
    x = 1,902,611.25/1,639.68
  6. Step 6: Final answer
    x = 1,160.36

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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.