Home / 128,708.85-177,421.34-90,360.82

Finding the Fourth Proportional to 128,708.85, 177,421.34 and 90,360.82

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Solution

The fourth proportional to 128,708.85, 177,421.34 and 90,360.82 is: 124,559.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.85 : 177,421.34 = 90,360.82 : x
  2. Step 2: Convert to fraction form
    128,708.85/177,421.34 = 90,360.82/x
  3. Step 3: Cross multiply
    128,708.85x = 177,421.34 × 90,360.82
  4. Step 4: Simplify right side
    128,708.85x = 16,031,936,709.30
  5. Step 5: Solve for x
    x = 16,031,936,709.30/128,708.85
  6. Step 6: Final answer
    x = 124,559.71

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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.