Home / 2,155.80-3,233.70-985.80

Finding the Fourth Proportional to 2,155.80, 3,233.70 and 985.80

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Solution

The fourth proportional to 2,155.80, 3,233.70 and 985.80 is: 1,478.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.80 : 3,233.70 = 985.80 : x
  2. Step 2: Convert to fraction form
    2,155.80/3,233.70 = 985.80/x
  3. Step 3: Cross multiply
    2,155.80x = 3,233.70 × 985.80
  4. Step 4: Simplify right side
    2,155.80x = 3,187,781.46
  5. Step 5: Solve for x
    x = 3,187,781.46/2,155.80
  6. Step 6: Final answer
    x = 1,478.70

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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.