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Finding the Fourth Proportional to 1,080.45, 1,620.90 and 431.19

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Solution

The fourth proportional to 1,080.45, 1,620.90 and 431.19 is: 646.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.45 : 1,620.90 = 431.19 : x
  2. Step 2: Convert to fraction form
    1,080.45/1,620.90 = 431.19/x
  3. Step 3: Cross multiply
    1,080.45x = 1,620.90 × 431.19
  4. Step 4: Simplify right side
    1,080.45x = 698,915.87
  5. Step 5: Solve for x
    x = 698,915.87/1,080.45
  6. Step 6: Final answer
    x = 646.87

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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.