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Finding the Fourth Proportional to 139,151.52, 192,029.12 and 78,720.88

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Solution

The fourth proportional to 139,151.52, 192,029.12 and 78,720.88 is: 108,634.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,151.52 : 192,029.12 = 78,720.88 : x
  2. Step 2: Convert to fraction form
    139,151.52/192,029.12 = 78,720.88/x
  3. Step 3: Cross multiply
    139,151.52x = 192,029.12 × 78,720.88
  4. Step 4: Simplify right side
    139,151.52x = 15,116,701,312.03
  5. Step 5: Solve for x
    x = 15,116,701,312.03/139,151.52
  6. Step 6: Final answer
    x = 108,634.83

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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.