Home / 1,243.30-1,713.80-1,007.60

Finding the Fourth Proportional to 1,243.30, 1,713.80 and 1,007.60

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Solution

The fourth proportional to 1,243.30, 1,713.80 and 1,007.60 is: 1,388.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.30 : 1,713.80 = 1,007.60 : x
  2. Step 2: Convert to fraction form
    1,243.30/1,713.80 = 1,007.60/x
  3. Step 3: Cross multiply
    1,243.30x = 1,713.80 × 1,007.60
  4. Step 4: Simplify right side
    1,243.30x = 1,726,824.88
  5. Step 5: Solve for x
    x = 1,726,824.88/1,243.30
  6. Step 6: Final answer
    x = 1,388.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.