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Finding the Fourth Proportional to 128,257.88, 176,995.87 and 71,674.52

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Solution

The fourth proportional to 128,257.88, 176,995.87 and 71,674.52 is: 98,910.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,257.88 : 176,995.87 = 71,674.52 : x
  2. Step 2: Convert to fraction form
    128,257.88/176,995.87 = 71,674.52/x
  3. Step 3: Cross multiply
    128,257.88x = 176,995.87 × 71,674.52
  4. Step 4: Simplify right side
    128,257.88x = 12,686,092,960.07
  5. Step 5: Solve for x
    x = 12,686,092,960.07/128,257.88
  6. Step 6: Final answer
    x = 98,910.83

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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.