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Finding the Fourth Proportional to 1,086, 1,628.76 and 355.60

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Solution

The fourth proportional to 1,086, 1,628.76 and 355.60 is: 533.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086 : 1,628.76 = 355.60 : x
  2. Step 2: Convert to fraction form
    1,086/1,628.76 = 355.60/x
  3. Step 3: Cross multiply
    1,086x = 1,628.76 × 355.60
  4. Step 4: Simplify right side
    1,086x = 579,187.06
  5. Step 5: Solve for x
    x = 579,187.06/1,086
  6. Step 6: Final answer
    x = 533.32

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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.