Home / 1,311.92-1,955.20-1,242.80

Finding the Fourth Proportional to 1,311.92, 1,955.20 and 1,242.80

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Solution

The fourth proportional to 1,311.92, 1,955.20 and 1,242.80 is: 1,852.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.92 : 1,955.20 = 1,242.80 : x
  2. Step 2: Convert to fraction form
    1,311.92/1,955.20 = 1,242.80/x
  3. Step 3: Cross multiply
    1,311.92x = 1,955.20 × 1,242.80
  4. Step 4: Simplify right side
    1,311.92x = 2,429,922.56
  5. Step 5: Solve for x
    x = 2,429,922.56/1,311.92
  6. Step 6: Final answer
    x = 1,852.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.