Home / 1,121.90-1,684.20-1,113.80

Finding the Fourth Proportional to 1,121.90, 1,684.20 and 1,113.80

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Solution

The fourth proportional to 1,121.90, 1,684.20 and 1,113.80 is: 1,672.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.90 : 1,684.20 = 1,113.80 : x
  2. Step 2: Convert to fraction form
    1,121.90/1,684.20 = 1,113.80/x
  3. Step 3: Cross multiply
    1,121.90x = 1,684.20 × 1,113.80
  4. Step 4: Simplify right side
    1,121.90x = 1,875,861.96
  5. Step 5: Solve for x
    x = 1,875,861.96/1,121.90
  6. Step 6: Final answer
    x = 1,672.04

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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.