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Finding the Fourth Proportional to 1,080.90, 1,621.38 and 431.58

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Solution

The fourth proportional to 1,080.90, 1,621.38 and 431.58 is: 647.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.90 : 1,621.38 = 431.58 : x
  2. Step 2: Convert to fraction form
    1,080.90/1,621.38 = 431.58/x
  3. Step 3: Cross multiply
    1,080.90x = 1,621.38 × 431.58
  4. Step 4: Simplify right side
    1,080.90x = 699,755.18
  5. Step 5: Solve for x
    x = 699,755.18/1,080.90
  6. Step 6: Final answer
    x = 647.38

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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.