Home / 139,225.92-192,129-78,795.47

Finding the Fourth Proportional to 139,225.92, 192,129 and 78,795.47

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Solution

The fourth proportional to 139,225.92, 192,129 and 78,795.47 is: 108,736.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,225.92 : 192,129 = 78,795.47 : x
  2. Step 2: Convert to fraction form
    139,225.92/192,129 = 78,795.47/x
  3. Step 3: Cross multiply
    139,225.92x = 192,129 × 78,795.47
  4. Step 4: Simplify right side
    139,225.92x = 15,138,893,894.99
  5. Step 5: Solve for x
    x = 15,138,893,894.99/139,225.92
  6. Step 6: Final answer
    x = 108,736.17

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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.