Home / 1,081.05-1,621.77-431.70

Finding the Fourth Proportional to 1,081.05, 1,621.77 and 431.70

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Solution

The fourth proportional to 1,081.05, 1,621.77 and 431.70 is: 647.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.05 : 1,621.77 = 431.70 : x
  2. Step 2: Convert to fraction form
    1,081.05/1,621.77 = 431.70/x
  3. Step 3: Cross multiply
    1,081.05x = 1,621.77 × 431.70
  4. Step 4: Simplify right side
    1,081.05x = 700,118.11
  5. Step 5: Solve for x
    x = 700,118.11/1,081.05
  6. Step 6: Final answer
    x = 647.63

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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.