Home / 2,146.80-3,220.20-686.07

Finding the Fourth Proportional to 2,146.80, 3,220.20 and 686.07

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Solution

The fourth proportional to 2,146.80, 3,220.20 and 686.07 is: 1,029.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,146.80 : 3,220.20 = 686.07 : x
  2. Step 2: Convert to fraction form
    2,146.80/3,220.20 = 686.07/x
  3. Step 3: Cross multiply
    2,146.80x = 3,220.20 × 686.07
  4. Step 4: Simplify right side
    2,146.80x = 2,209,263.08
  5. Step 5: Solve for x
    x = 2,209,263.08/2,146.80
  6. Step 6: Final answer
    x = 1,029.10

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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.