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Finding the Fourth Proportional to 423.65, 636.11 and 345.80

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Solution

The fourth proportional to 423.65, 636.11 and 345.80 is: 519.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.65 : 636.11 = 345.80 : x
  2. Step 2: Convert to fraction form
    423.65/636.11 = 345.80/x
  3. Step 3: Cross multiply
    423.65x = 636.11 × 345.80
  4. Step 4: Simplify right side
    423.65x = 219,966.84
  5. Step 5: Solve for x
    x = 219,966.84/423.65
  6. Step 6: Final answer
    x = 519.22

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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.