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Finding the Fourth Proportional to 139,677.06, 192,745.91 and 78,418.74

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Solution

The fourth proportional to 139,677.06, 192,745.91 and 78,418.74 is: 108,213.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,677.06 : 192,745.91 = 78,418.74 : x
  2. Step 2: Convert to fraction form
    139,677.06/192,745.91 = 78,418.74/x
  3. Step 3: Cross multiply
    139,677.06x = 192,745.91 × 78,418.74
  4. Step 4: Simplify right side
    139,677.06x = 15,114,891,402.35
  5. Step 5: Solve for x
    x = 15,114,891,402.35/139,677.06
  6. Step 6: Final answer
    x = 108,213.13

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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.