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Finding the Fourth Proportional to 25,640, 38,460 and 7,172

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Solution

The fourth proportional to 25,640, 38,460 and 7,172 is: 10,758

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,640 : 38,460 = 7,172 : x
  2. Step 2: Convert to fraction form
    25,640/38,460 = 7,172/x
  3. Step 3: Cross multiply
    25,640x = 38,460 × 7,172
  4. Step 4: Simplify right side
    25,640x = 275,835,120
  5. Step 5: Solve for x
    x = 275,835,120/25,640
  6. Step 6: Final answer
    x = 10,758

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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.