Home / 1,081.20-1,621.80-1,008.30

Finding the Fourth Proportional to 1,081.20, 1,621.80 and 1,008.30

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Solution

The fourth proportional to 1,081.20, 1,621.80 and 1,008.30 is: 1,512.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.20 : 1,621.80 = 1,008.30 : x
  2. Step 2: Convert to fraction form
    1,081.20/1,621.80 = 1,008.30/x
  3. Step 3: Cross multiply
    1,081.20x = 1,621.80 × 1,008.30
  4. Step 4: Simplify right side
    1,081.20x = 1,635,260.94
  5. Step 5: Solve for x
    x = 1,635,260.94/1,081.20
  6. Step 6: Final answer
    x = 1,512.45

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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.