Home / 2,213.40-3,321.70-915.80

Finding the Fourth Proportional to 2,213.40, 3,321.70 and 915.80

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Solution

The fourth proportional to 2,213.40, 3,321.70 and 915.80 is: 1,374.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,213.40 : 3,321.70 = 915.80 : x
  2. Step 2: Convert to fraction form
    2,213.40/3,321.70 = 915.80/x
  3. Step 3: Cross multiply
    2,213.40x = 3,321.70 × 915.80
  4. Step 4: Simplify right side
    2,213.40x = 3,042,012.86
  5. Step 5: Solve for x
    x = 3,042,012.86/2,213.40
  6. Step 6: Final answer
    x = 1,374.36

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1.5x scale

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.