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Finding the Fourth Proportional to 139,420.99, 192,400.30 and 78,991.52

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Solution

The fourth proportional to 139,420.99, 192,400.30 and 78,991.52 is: 109,007.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,420.99 : 192,400.30 = 78,991.52 : x
  2. Step 2: Convert to fraction form
    139,420.99/192,400.30 = 78,991.52/x
  3. Step 3: Cross multiply
    139,420.99x = 192,400.30 × 78,991.52
  4. Step 4: Simplify right side
    139,420.99x = 15,197,992,145.46
  5. Step 5: Solve for x
    x = 15,197,992,145.46/139,420.99
  6. Step 6: Final answer
    x = 109,007.92

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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.