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Finding the Fourth Proportional to 139,628.88, 192,691.80 and 75,970.80

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Solution

The fourth proportional to 139,628.88, 192,691.80 and 75,970.80 is: 104,841.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,628.88 : 192,691.80 = 75,970.80 : x
  2. Step 2: Convert to fraction form
    139,628.88/192,691.80 = 75,970.80/x
  3. Step 3: Cross multiply
    139,628.88x = 192,691.80 × 75,970.80
  4. Step 4: Simplify right side
    139,628.88x = 14,638,950,199.44
  5. Step 5: Solve for x
    x = 14,638,950,199.44/139,628.88
  6. Step 6: Final answer
    x = 104,841.85

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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.