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Finding the Fourth Proportional to 128,541.52, 177,390.84 and 71,956.54

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Solution

The fourth proportional to 128,541.52, 177,390.84 and 71,956.54 is: 99,302.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,541.52 : 177,390.84 = 71,956.54 : x
  2. Step 2: Convert to fraction form
    128,541.52/177,390.84 = 71,956.54/x
  3. Step 3: Cross multiply
    128,541.52x = 177,390.84 × 71,956.54
  4. Step 4: Simplify right side
    128,541.52x = 12,764,431,074.09
  5. Step 5: Solve for x
    x = 12,764,431,074.09/128,541.52
  6. Step 6: Final answer
    x = 99,302.01

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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.