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Finding the Fourth Proportional to 423.42, 634.95 and 130.85

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Solution

The fourth proportional to 423.42, 634.95 and 130.85 is: 196.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.42 : 634.95 = 130.85 : x
  2. Step 2: Convert to fraction form
    423.42/634.95 = 130.85/x
  3. Step 3: Cross multiply
    423.42x = 634.95 × 130.85
  4. Step 4: Simplify right side
    423.42x = 83,080.03
  5. Step 5: Solve for x
    x = 83,080.03/423.42
  6. Step 6: Final answer
    x = 196.21

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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.