Home / 1,611.30-2,221.65-1,238.70

Finding the Fourth Proportional to 1,611.30, 2,221.65 and 1,238.70

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Solution

The fourth proportional to 1,611.30, 2,221.65 and 1,238.70 is: 1,707.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.30 : 2,221.65 = 1,238.70 : x
  2. Step 2: Convert to fraction form
    1,611.30/2,221.65 = 1,238.70/x
  3. Step 3: Cross multiply
    1,611.30x = 2,221.65 × 1,238.70
  4. Step 4: Simplify right side
    1,611.30x = 2,751,957.86
  5. Step 5: Solve for x
    x = 2,751,957.86/1,611.30
  6. Step 6: Final answer
    x = 1,707.91

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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.