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Finding the Fourth Proportional to 591.40, 816.25 and 355.54

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Solution

The fourth proportional to 591.40, 816.25 and 355.54 is: 490.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.40 : 816.25 = 355.54 : x
  2. Step 2: Convert to fraction form
    591.40/816.25 = 355.54/x
  3. Step 3: Cross multiply
    591.40x = 816.25 × 355.54
  4. Step 4: Simplify right side
    591.40x = 290,206.60
  5. Step 5: Solve for x
    x = 290,206.60/591.40
  6. Step 6: Final answer
    x = 490.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.