Home / 1,265.02-1,896.60-639.90

Finding the Fourth Proportional to 1,265.02, 1,896.60 and 639.90

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Solution

The fourth proportional to 1,265.02, 1,896.60 and 639.90 is: 959.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.02 : 1,896.60 = 639.90 : x
  2. Step 2: Convert to fraction form
    1,265.02/1,896.60 = 639.90/x
  3. Step 3: Cross multiply
    1,265.02x = 1,896.60 × 639.90
  4. Step 4: Simplify right side
    1,265.02x = 1,213,634.34
  5. Step 5: Solve for x
    x = 1,213,634.34/1,265.02
  6. Step 6: Final answer
    x = 959.38

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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.