Home / 128,638.72-177,519.36-72,049.92

Finding the Fourth Proportional to 128,638.72, 177,519.36 and 72,049.92

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Solution

The fourth proportional to 128,638.72, 177,519.36 and 72,049.92 is: 99,427.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,638.72 : 177,519.36 = 72,049.92 : x
  2. Step 2: Convert to fraction form
    128,638.72/177,519.36 = 72,049.92/x
  3. Step 3: Cross multiply
    128,638.72x = 177,519.36 × 72,049.92
  4. Step 4: Simplify right side
    128,638.72x = 12,790,255,686.45
  5. Step 5: Solve for x
    x = 12,790,255,686.45/128,638.72
  6. Step 6: Final answer
    x = 99,427.73

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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.