Home / 1,816.20-2,505.78-1,117.80

Finding the Fourth Proportional to 1,816.20, 2,505.78 and 1,117.80

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Solution

The fourth proportional to 1,816.20, 2,505.78 and 1,117.80 is: 1,542.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,816.20 : 2,505.78 = 1,117.80 : x
  2. Step 2: Convert to fraction form
    1,816.20/2,505.78 = 1,117.80/x
  3. Step 3: Cross multiply
    1,816.20x = 2,505.78 × 1,117.80
  4. Step 4: Simplify right side
    1,816.20x = 2,800,960.88
  5. Step 5: Solve for x
    x = 2,800,960.88/1,816.20
  6. Step 6: Final answer
    x = 1,542.21

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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.