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Finding the Fourth Proportional to 128,976.33, 177,987.33 and 72,387.70

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Solution

The fourth proportional to 128,976.33, 177,987.33 and 72,387.70 is: 99,895.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,976.33 : 177,987.33 = 72,387.70 : x
  2. Step 2: Convert to fraction form
    128,976.33/177,987.33 = 72,387.70/x
  3. Step 3: Cross multiply
    128,976.33x = 177,987.33 × 72,387.70
  4. Step 4: Simplify right side
    128,976.33x = 12,884,093,892.81
  5. Step 5: Solve for x
    x = 12,884,093,892.81/128,976.33
  6. Step 6: Final answer
    x = 99,895.03

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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.