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Finding the Fourth Proportional to 917.50, 1,375.15 and 423.23

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Solution

The fourth proportional to 917.50, 1,375.15 and 423.23 is: 634.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.50 : 1,375.15 = 423.23 : x
  2. Step 2: Convert to fraction form
    917.50/1,375.15 = 423.23/x
  3. Step 3: Cross multiply
    917.50x = 1,375.15 × 423.23
  4. Step 4: Simplify right side
    917.50x = 582,004.73
  5. Step 5: Solve for x
    x = 582,004.73/917.50
  6. Step 6: Final answer
    x = 634.34

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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.