Home / 1,221.21-1,683.59-1,182.92

Finding the Fourth Proportional to 1,221.21, 1,683.59 and 1,182.92

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Solution

The fourth proportional to 1,221.21, 1,683.59 and 1,182.92 is: 1,630.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.21 : 1,683.59 = 1,182.92 : x
  2. Step 2: Convert to fraction form
    1,221.21/1,683.59 = 1,182.92/x
  3. Step 3: Cross multiply
    1,221.21x = 1,683.59 × 1,182.92
  4. Step 4: Simplify right side
    1,221.21x = 1,991,537.95
  5. Step 5: Solve for x
    x = 1,991,537.95/1,221.21
  6. Step 6: Final answer
    x = 1,630.79

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1.5x scale

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.