Home / 128,723.91-177,634.18-72,131.64

Finding the Fourth Proportional to 128,723.91, 177,634.18 and 72,131.64

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Solution

The fourth proportional to 128,723.91, 177,634.18 and 72,131.64 is: 99,538.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,723.91 : 177,634.18 = 72,131.64 : x
  2. Step 2: Convert to fraction form
    128,723.91/177,634.18 = 72,131.64/x
  3. Step 3: Cross multiply
    128,723.91x = 177,634.18 × 72,131.64
  4. Step 4: Simplify right side
    128,723.91x = 12,813,044,723.46
  5. Step 5: Solve for x
    x = 12,813,044,723.46/128,723.91
  6. Step 6: Final answer
    x = 99,538.96

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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.