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Finding the Fourth Proportional to 591.91, 816.69 and 355.90

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Solution

The fourth proportional to 591.91, 816.69 and 355.90 is: 491.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.91 : 816.69 = 355.90 : x
  2. Step 2: Convert to fraction form
    591.91/816.69 = 355.90/x
  3. Step 3: Cross multiply
    591.91x = 816.69 × 355.90
  4. Step 4: Simplify right side
    591.91x = 290,659.97
  5. Step 5: Solve for x
    x = 290,659.97/591.91
  6. Step 6: Final answer
    x = 491.05

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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.