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Finding the Fourth Proportional to 423.19, 634.50 and 203.70

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Solution

The fourth proportional to 423.19, 634.50 and 203.70 is: 305.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.19 : 634.50 = 203.70 : x
  2. Step 2: Convert to fraction form
    423.19/634.50 = 203.70/x
  3. Step 3: Cross multiply
    423.19x = 634.50 × 203.70
  4. Step 4: Simplify right side
    423.19x = 129,247.65
  5. Step 5: Solve for x
    x = 129,247.65/423.19
  6. Step 6: Final answer
    x = 305.41

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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.