Home / 1,080.27-1,620.59-431.55

Finding the Fourth Proportional to 1,080.27, 1,620.59 and 431.55

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Solution

The fourth proportional to 1,080.27, 1,620.59 and 431.55 is: 647.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.27 : 1,620.59 = 431.55 : x
  2. Step 2: Convert to fraction form
    1,080.27/1,620.59 = 431.55/x
  3. Step 3: Cross multiply
    1,080.27x = 1,620.59 × 431.55
  4. Step 4: Simplify right side
    1,080.27x = 699,363.46
  5. Step 5: Solve for x
    x = 699,363.46/1,080.27
  6. Step 6: Final answer
    x = 647.40

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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.