Home / 128,589.88-177,438.06-71,992.12

Finding the Fourth Proportional to 128,589.88, 177,438.06 and 71,992.12

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Solution

The fourth proportional to 128,589.88, 177,438.06 and 71,992.12 is: 99,340.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,589.88 : 177,438.06 = 71,992.12 : x
  2. Step 2: Convert to fraction form
    128,589.88/177,438.06 = 71,992.12/x
  3. Step 3: Cross multiply
    128,589.88x = 177,438.06 × 71,992.12
  4. Step 4: Simplify right side
    128,589.88x = 12,774,142,108.09
  5. Step 5: Solve for x
    x = 12,774,142,108.09/128,589.88
  6. Step 6: Final answer
    x = 99,340.18

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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.