Home / 1,321.10-1,981.65-1,301.90

Finding the Fourth Proportional to 1,321.10, 1,981.65 and 1,301.90

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Solution

The fourth proportional to 1,321.10, 1,981.65 and 1,301.90 is: 1,952.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.10 : 1,981.65 = 1,301.90 : x
  2. Step 2: Convert to fraction form
    1,321.10/1,981.65 = 1,301.90/x
  3. Step 3: Cross multiply
    1,321.10x = 1,981.65 × 1,301.90
  4. Step 4: Simplify right side
    1,321.10x = 2,579,910.14
  5. Step 5: Solve for x
    x = 2,579,910.14/1,321.10
  6. Step 6: Final answer
    x = 1,952.85

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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.