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Finding the Fourth Proportional to 128,750.96, 177,687.24 and 72,173.28

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Solution

The fourth proportional to 128,750.96, 177,687.24 and 72,173.28 is: 99,605.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,750.96 : 177,687.24 = 72,173.28 : x
  2. Step 2: Convert to fraction form
    128,750.96/177,687.24 = 72,173.28/x
  3. Step 3: Cross multiply
    128,750.96x = 177,687.24 × 72,173.28
  4. Step 4: Simplify right side
    128,750.96x = 12,824,270,924.95
  5. Step 5: Solve for x
    x = 12,824,270,924.95/128,750.96
  6. Step 6: Final answer
    x = 99,605.25

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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.