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Finding the Fourth Proportional to 81,128, 121,692 and 25,724

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Solution

The fourth proportional to 81,128, 121,692 and 25,724 is: 38,586

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,128 : 121,692 = 25,724 : x
  2. Step 2: Convert to fraction form
    81,128/121,692 = 25,724/x
  3. Step 3: Cross multiply
    81,128x = 121,692 × 25,724
  4. Step 4: Simplify right side
    81,128x = 3,130,405,008
  5. Step 5: Solve for x
    x = 3,130,405,008/81,128
  6. Step 6: Final answer
    x = 38,586

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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.