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Finding the Fourth Proportional to 591.61, 816.40 and 355.58

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Solution

The fourth proportional to 591.61, 816.40 and 355.58 is: 490.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.61 : 816.40 = 355.58 : x
  2. Step 2: Convert to fraction form
    591.61/816.40 = 355.58/x
  3. Step 3: Cross multiply
    591.61x = 816.40 × 355.58
  4. Step 4: Simplify right side
    591.61x = 290,295.51
  5. Step 5: Solve for x
    x = 290,295.51/591.61
  6. Step 6: Final answer
    x = 490.69

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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.