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Finding the Fourth Proportional to 1,080.70, 1,621.20 and 422.46

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Solution

The fourth proportional to 1,080.70, 1,621.20 and 422.46 is: 633.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.70 : 1,621.20 = 422.46 : x
  2. Step 2: Convert to fraction form
    1,080.70/1,621.20 = 422.46/x
  3. Step 3: Cross multiply
    1,080.70x = 1,621.20 × 422.46
  4. Step 4: Simplify right side
    1,080.70x = 684,892.15
  5. Step 5: Solve for x
    x = 684,892.15/1,080.70
  6. Step 6: Final answer
    x = 633.75

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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.