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Finding the Fourth Proportional to 1,085.82, 1,628.99 and 355.40

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Solution

The fourth proportional to 1,085.82, 1,628.99 and 355.40 is: 533.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.82 : 1,628.99 = 355.40 : x
  2. Step 2: Convert to fraction form
    1,085.82/1,628.99 = 355.40/x
  3. Step 3: Cross multiply
    1,085.82x = 1,628.99 × 355.40
  4. Step 4: Simplify right side
    1,085.82x = 578,933.12
  5. Step 5: Solve for x
    x = 578,933.12/1,085.82
  6. Step 6: Final answer
    x = 533.18

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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.