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Finding the Fourth Proportional to 1,086.11, 1,628.79 and 355.50

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Solution

The fourth proportional to 1,086.11, 1,628.79 and 355.50 is: 533.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.11 : 1,628.79 = 355.50 : x
  2. Step 2: Convert to fraction form
    1,086.11/1,628.79 = 355.50/x
  3. Step 3: Cross multiply
    1,086.11x = 1,628.79 × 355.50
  4. Step 4: Simplify right side
    1,086.11x = 579,033.51
  5. Step 5: Solve for x
    x = 579,033.51/1,086.11
  6. Step 6: Final answer
    x = 533.13

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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.