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Finding the Fourth Proportional to 1,725, 2,380.50 and 939

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Solution

The fourth proportional to 1,725, 2,380.50 and 939 is: 1,295.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,725 : 2,380.50 = 939 : x
  2. Step 2: Convert to fraction form
    1,725/2,380.50 = 939/x
  3. Step 3: Cross multiply
    1,725x = 2,380.50 × 939
  4. Step 4: Simplify right side
    1,725x = 2,235,289.50
  5. Step 5: Solve for x
    x = 2,235,289.50/1,725
  6. Step 6: Final answer
    x = 1,295.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.