Home / 1,382.06-1,905.12-1,215.30

Finding the Fourth Proportional to 1,382.06, 1,905.12 and 1,215.30

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Solution

The fourth proportional to 1,382.06, 1,905.12 and 1,215.30 is: 1,675.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.06 : 1,905.12 = 1,215.30 : x
  2. Step 2: Convert to fraction form
    1,382.06/1,905.12 = 1,215.30/x
  3. Step 3: Cross multiply
    1,382.06x = 1,905.12 × 1,215.30
  4. Step 4: Simplify right side
    1,382.06x = 2,315,299.48
  5. Step 5: Solve for x
    x = 2,315,299.48/1,382.06
  6. Step 6: Final answer
    x = 1,675.25

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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.