Home / 138,715.44-191,427.96-78,288.63

Finding the Fourth Proportional to 138,715.44, 191,427.96 and 78,288.63

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Solution

The fourth proportional to 138,715.44, 191,427.96 and 78,288.63 is: 108,038.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,715.44 : 191,427.96 = 78,288.63 : x
  2. Step 2: Convert to fraction form
    138,715.44/191,427.96 = 78,288.63/x
  3. Step 3: Cross multiply
    138,715.44x = 191,427.96 × 78,288.63
  4. Step 4: Simplify right side
    138,715.44x = 14,986,631,867.45
  5. Step 5: Solve for x
    x = 14,986,631,867.45/138,715.44
  6. Step 6: Final answer
    x = 108,038.67

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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.