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Finding the Fourth Proportional to 128,958.91, 177,979.69 and 72,370.28

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Solution

The fourth proportional to 128,958.91, 177,979.69 and 72,370.28 is: 99,880.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,958.91 : 177,979.69 = 72,370.28 : x
  2. Step 2: Convert to fraction form
    128,958.91/177,979.69 = 72,370.28/x
  3. Step 3: Cross multiply
    128,958.91x = 177,979.69 × 72,370.28
  4. Step 4: Simplify right side
    128,958.91x = 12,880,439,999.61
  5. Step 5: Solve for x
    x = 12,880,439,999.61/128,958.91
  6. Step 6: Final answer
    x = 99,880.19

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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.