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Finding the Fourth Proportional to 128,979.36, 177,991.32 and 72,390.60

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Solution

The fourth proportional to 128,979.36, 177,991.32 and 72,390.60 is: 99,898.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979.36 : 177,991.32 = 72,390.60 : x
  2. Step 2: Convert to fraction form
    128,979.36/177,991.32 = 72,390.60/x
  3. Step 3: Cross multiply
    128,979.36x = 177,991.32 × 72,390.60
  4. Step 4: Simplify right side
    128,979.36x = 12,884,898,449.59
  5. Step 5: Solve for x
    x = 12,884,898,449.59/128,979.36
  6. Step 6: Final answer
    x = 99,898.92

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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.