Home / 2,017.80-2,785.10-1,221.13

Finding the Fourth Proportional to 2,017.80, 2,785.10 and 1,221.13

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Solution

The fourth proportional to 2,017.80, 2,785.10 and 1,221.13 is: 1,685.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,017.80 : 2,785.10 = 1,221.13 : x
  2. Step 2: Convert to fraction form
    2,017.80/2,785.10 = 1,221.13/x
  3. Step 3: Cross multiply
    2,017.80x = 2,785.10 × 1,221.13
  4. Step 4: Simplify right side
    2,017.80x = 3,400,969.16
  5. Step 5: Solve for x
    x = 3,400,969.16/2,017.80
  6. Step 6: Final answer
    x = 1,685.48

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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.