Home / 1,086.40-1,629.15-355.78

Finding the Fourth Proportional to 1,086.40, 1,629.15 and 355.78

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Solution

The fourth proportional to 1,086.40, 1,629.15 and 355.78 is: 533.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.40 : 1,629.15 = 355.78 : x
  2. Step 2: Convert to fraction form
    1,086.40/1,629.15 = 355.78/x
  3. Step 3: Cross multiply
    1,086.40x = 1,629.15 × 355.78
  4. Step 4: Simplify right side
    1,086.40x = 579,618.99
  5. Step 5: Solve for x
    x = 579,618.99/1,086.40
  6. Step 6: Final answer
    x = 533.52

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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.