Home / 139,400.08-192,381.59-78,971.20

Finding the Fourth Proportional to 139,400.08, 192,381.59 and 78,971.20

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Solution

The fourth proportional to 139,400.08, 192,381.59 and 78,971.20 is: 108,985.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,400.08 : 192,381.59 = 78,971.20 : x
  2. Step 2: Convert to fraction form
    139,400.08/192,381.59 = 78,971.20/x
  3. Step 3: Cross multiply
    139,400.08x = 192,381.59 × 78,971.20
  4. Step 4: Simplify right side
    139,400.08x = 15,192,604,736.68
  5. Step 5: Solve for x
    x = 15,192,604,736.68/139,400.08
  6. Step 6: Final answer
    x = 108,985.63

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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.