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Finding the Fourth Proportional to 423.17, 634.75 and 115.05

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Solution

The fourth proportional to 423.17, 634.75 and 115.05 is: 172.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.17 : 634.75 = 115.05 : x
  2. Step 2: Convert to fraction form
    423.17/634.75 = 115.05/x
  3. Step 3: Cross multiply
    423.17x = 634.75 × 115.05
  4. Step 4: Simplify right side
    423.17x = 73,029.86
  5. Step 5: Solve for x
    x = 73,029.86/423.17
  6. Step 6: Final answer
    x = 172.58

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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.