Home / 128,519.48-177,359.28-71,930.72

Finding the Fourth Proportional to 128,519.48, 177,359.28 and 71,930.72

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Solution

The fourth proportional to 128,519.48, 177,359.28 and 71,930.72 is: 99,265.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,519.48 : 177,359.28 = 71,930.72 : x
  2. Step 2: Convert to fraction form
    128,519.48/177,359.28 = 71,930.72/x
  3. Step 3: Cross multiply
    128,519.48x = 177,359.28 × 71,930.72
  4. Step 4: Simplify right side
    128,519.48x = 12,757,580,709.08
  5. Step 5: Solve for x
    x = 12,757,580,709.08/128,519.48
  6. Step 6: Final answer
    x = 99,265.74

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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.