Home / 1,321.30-1,986.45-1,079.58

Finding the Fourth Proportional to 1,321.30, 1,986.45 and 1,079.58

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Solution

The fourth proportional to 1,321.30, 1,986.45 and 1,079.58 is: 1,623.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.30 : 1,986.45 = 1,079.58 : x
  2. Step 2: Convert to fraction form
    1,321.30/1,986.45 = 1,079.58/x
  3. Step 3: Cross multiply
    1,321.30x = 1,986.45 × 1,079.58
  4. Step 4: Simplify right side
    1,321.30x = 2,144,531.69
  5. Step 5: Solve for x
    x = 2,144,531.69/1,321.30
  6. Step 6: Final answer
    x = 1,623.05

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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.