Home / 1,040.12-1,431.30-1,012.88

Finding the Fourth Proportional to 1,040.12, 1,431.30 and 1,012.88

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Solution

The fourth proportional to 1,040.12, 1,431.30 and 1,012.88 is: 1,393.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.12 : 1,431.30 = 1,012.88 : x
  2. Step 2: Convert to fraction form
    1,040.12/1,431.30 = 1,012.88/x
  3. Step 3: Cross multiply
    1,040.12x = 1,431.30 × 1,012.88
  4. Step 4: Simplify right side
    1,040.12x = 1,449,735.14
  5. Step 5: Solve for x
    x = 1,449,735.14/1,040.12
  6. Step 6: Final answer
    x = 1,393.82

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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.