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Finding the Fourth Proportional to 100,992.72, 139,376.20 and 55,670.48

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Solution

The fourth proportional to 100,992.72, 139,376.20 and 55,670.48 is: 76,828.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,992.72 : 139,376.20 = 55,670.48 : x
  2. Step 2: Convert to fraction form
    100,992.72/139,376.20 = 55,670.48/x
  3. Step 3: Cross multiply
    100,992.72x = 139,376.20 × 55,670.48
  4. Step 4: Simplify right side
    100,992.72x = 7,759,139,954.58
  5. Step 5: Solve for x
    x = 7,759,139,954.58/100,992.72
  6. Step 6: Final answer
    x = 76,828.71

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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.