Home / 2,147.39-3,221.28-686.19

Finding the Fourth Proportional to 2,147.39, 3,221.28 and 686.19

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Solution

The fourth proportional to 2,147.39, 3,221.28 and 686.19 is: 1,029.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.39 : 3,221.28 = 686.19 : x
  2. Step 2: Convert to fraction form
    2,147.39/3,221.28 = 686.19/x
  3. Step 3: Cross multiply
    2,147.39x = 3,221.28 × 686.19
  4. Step 4: Simplify right side
    2,147.39x = 2,210,410.12
  5. Step 5: Solve for x
    x = 2,210,410.12/2,147.39
  6. Step 6: Final answer
    x = 1,029.35

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1.5x scale

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.