Home / 138,938.68-191,742.83-78,511.87

Finding the Fourth Proportional to 138,938.68, 191,742.83 and 78,511.87

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Solution

The fourth proportional to 138,938.68, 191,742.83 and 78,511.87 is: 108,350.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,938.68 : 191,742.83 = 78,511.87 : x
  2. Step 2: Convert to fraction form
    138,938.68/191,742.83 = 78,511.87/x
  3. Step 3: Cross multiply
    138,938.68x = 191,742.83 × 78,511.87
  4. Step 4: Simplify right side
    138,938.68x = 15,054,088,142.39
  5. Step 5: Solve for x
    x = 15,054,088,142.39/138,938.68
  6. Step 6: Final answer
    x = 108,350.59

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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.