Home / 1,086.20-1,629.30-539.45

Finding the Fourth Proportional to 1,086.20, 1,629.30 and 539.45

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Solution

The fourth proportional to 1,086.20, 1,629.30 and 539.45 is: 809.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.20 : 1,629.30 = 539.45 : x
  2. Step 2: Convert to fraction form
    1,086.20/1,629.30 = 539.45/x
  3. Step 3: Cross multiply
    1,086.20x = 1,629.30 × 539.45
  4. Step 4: Simplify right side
    1,086.20x = 878,925.89
  5. Step 5: Solve for x
    x = 878,925.89/1,086.20
  6. Step 6: Final answer
    x = 809.18

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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.