Home / 1,321.92-1,980.45-1,176.12

Finding the Fourth Proportional to 1,321.92, 1,980.45 and 1,176.12

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Solution

The fourth proportional to 1,321.92, 1,980.45 and 1,176.12 is: 1,762.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.92 : 1,980.45 = 1,176.12 : x
  2. Step 2: Convert to fraction form
    1,321.92/1,980.45 = 1,176.12/x
  3. Step 3: Cross multiply
    1,321.92x = 1,980.45 × 1,176.12
  4. Step 4: Simplify right side
    1,321.92x = 2,329,246.85
  5. Step 5: Solve for x
    x = 2,329,246.85/1,321.92
  6. Step 6: Final answer
    x = 1,762.02

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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.