Home / 128,421.76-177,229.92-71,836.96

Finding the Fourth Proportional to 128,421.76, 177,229.92 and 71,836.96

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Solution

The fourth proportional to 128,421.76, 177,229.92 and 71,836.96 is: 99,139.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,421.76 : 177,229.92 = 71,836.96 : x
  2. Step 2: Convert to fraction form
    128,421.76/177,229.92 = 71,836.96/x
  3. Step 3: Cross multiply
    128,421.76x = 177,229.92 × 71,836.96
  4. Step 4: Simplify right side
    128,421.76x = 12,731,658,673.84
  5. Step 5: Solve for x
    x = 12,731,658,673.84/128,421.76
  6. Step 6: Final answer
    x = 99,139.42

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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.