Home / 128,338.78-177,115.26-71,750.56

Finding the Fourth Proportional to 128,338.78, 177,115.26 and 71,750.56

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Solution

The fourth proportional to 128,338.78, 177,115.26 and 71,750.56 is: 99,020.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,338.78 : 177,115.26 = 71,750.56 : x
  2. Step 2: Convert to fraction form
    128,338.78/177,115.26 = 71,750.56/x
  3. Step 3: Cross multiply
    128,338.78x = 177,115.26 × 71,750.56
  4. Step 4: Simplify right side
    128,338.78x = 12,708,119,089.55
  5. Step 5: Solve for x
    x = 12,708,119,089.55/128,338.78
  6. Step 6: Final answer
    x = 99,020.10

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1.5x scale

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.