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Finding the Fourth Proportional to 128,376.81, 192,739.86 and 72,256.56

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Solution

The fourth proportional to 128,376.81, 192,739.86 and 72,256.56 is: 108,483.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,376.81 : 192,739.86 = 72,256.56 : x
  2. Step 2: Convert to fraction form
    128,376.81/192,739.86 = 72,256.56/x
  3. Step 3: Cross multiply
    128,376.81x = 192,739.86 × 72,256.56
  4. Step 4: Simplify right side
    128,376.81x = 13,926,719,258.48
  5. Step 5: Solve for x
    x = 13,926,719,258.48/128,376.81
  6. Step 6: Final answer
    x = 108,483.14

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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.