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Finding the Fourth Proportional to 128,478, 192,636 and 61,934.88

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Solution

The fourth proportional to 128,478, 192,636 and 61,934.88 is: 92,863.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,478 : 192,636 = 61,934.88 : x
  2. Step 2: Convert to fraction form
    128,478/192,636 = 61,934.88/x
  3. Step 3: Cross multiply
    128,478x = 192,636 × 61,934.88
  4. Step 4: Simplify right side
    128,478x = 11,930,887,543.68
  5. Step 5: Solve for x
    x = 11,930,887,543.68/128,478
  6. Step 6: Final answer
    x = 92,863.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.