Home / 1,086.20-1,628.31-355.40

Finding the Fourth Proportional to 1,086.20, 1,628.31 and 355.40

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Solution

The fourth proportional to 1,086.20, 1,628.31 and 355.40 is: 532.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.20 : 1,628.31 = 355.40 : x
  2. Step 2: Convert to fraction form
    1,086.20/1,628.31 = 355.40/x
  3. Step 3: Cross multiply
    1,086.20x = 1,628.31 × 355.40
  4. Step 4: Simplify right side
    1,086.20x = 578,701.37
  5. Step 5: Solve for x
    x = 578,701.37/1,086.20
  6. Step 6: Final answer
    x = 532.78

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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.