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Finding the Fourth Proportional to 1,085.99, 1,628.81 and 355.56

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Solution

The fourth proportional to 1,085.99, 1,628.81 and 355.56 is: 533.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.99 : 1,628.81 = 355.56 : x
  2. Step 2: Convert to fraction form
    1,085.99/1,628.81 = 355.56/x
  3. Step 3: Cross multiply
    1,085.99x = 1,628.81 × 355.56
  4. Step 4: Simplify right side
    1,085.99x = 579,139.68
  5. Step 5: Solve for x
    x = 579,139.68/1,085.99
  6. Step 6: Final answer
    x = 533.28

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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.