Home / 135,738.78-187,338.87-78,366.63

Finding the Fourth Proportional to 135,738.78, 187,338.87 and 78,366.63

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Solution

The fourth proportional to 135,738.78, 187,338.87 and 78,366.63 is: 108,157.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,738.78 : 187,338.87 = 78,366.63 : x
  2. Step 2: Convert to fraction form
    135,738.78/187,338.87 = 78,366.63/x
  3. Step 3: Cross multiply
    135,738.78x = 187,338.87 × 78,366.63
  4. Step 4: Simplify right side
    135,738.78x = 14,681,115,909.91
  5. Step 5: Solve for x
    x = 14,681,115,909.91/135,738.78
  6. Step 6: Final answer
    x = 108,157.12

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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.