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Finding the Fourth Proportional to 591.21, 815.91 and 342.60

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Solution

The fourth proportional to 591.21, 815.91 and 342.60 is: 472.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    591.21 : 815.91 = 342.60 : x
  2. Step 2: Convert to fraction form
    591.21/815.91 = 342.60/x
  3. Step 3: Cross multiply
    591.21x = 815.91 × 342.60
  4. Step 4: Simplify right side
    591.21x = 279,530.77
  5. Step 5: Solve for x
    x = 279,530.77/591.21
  6. Step 6: Final answer
    x = 472.81

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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.