Home / 1,220.12-1,684.02-1,121.72

Finding the Fourth Proportional to 1,220.12, 1,684.02 and 1,121.72

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Solution

The fourth proportional to 1,220.12, 1,684.02 and 1,121.72 is: 1,548.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.12 : 1,684.02 = 1,121.72 : x
  2. Step 2: Convert to fraction form
    1,220.12/1,684.02 = 1,121.72/x
  3. Step 3: Cross multiply
    1,220.12x = 1,684.02 × 1,121.72
  4. Step 4: Simplify right side
    1,220.12x = 1,888,998.91
  5. Step 5: Solve for x
    x = 1,888,998.91/1,220.12
  6. Step 6: Final answer
    x = 1,548.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.