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Finding the Fourth Proportional to 128,959.56, 177,976.98 and 72,371.16

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Solution

The fourth proportional to 128,959.56, 177,976.98 and 72,371.16 is: 99,879.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,959.56 : 177,976.98 = 72,371.16 : x
  2. Step 2: Convert to fraction form
    128,959.56/177,976.98 = 72,371.16/x
  3. Step 3: Cross multiply
    128,959.56x = 177,976.98 × 72,371.16
  4. Step 4: Simplify right side
    128,959.56x = 12,880,400,495.90
  5. Step 5: Solve for x
    x = 12,880,400,495.90/128,959.56
  6. Step 6: Final answer
    x = 99,879.38

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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.