Home / 138,601.85-191,270.50-78,172.36

Finding the Fourth Proportional to 138,601.85, 191,270.50 and 78,172.36

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Solution

The fourth proportional to 138,601.85, 191,270.50 and 78,172.36 is: 107,877.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,601.85 : 191,270.50 = 78,172.36 : x
  2. Step 2: Convert to fraction form
    138,601.85/191,270.50 = 78,172.36/x
  3. Step 3: Cross multiply
    138,601.85x = 191,270.50 × 78,172.36
  4. Step 4: Simplify right side
    138,601.85x = 14,952,065,709.77
  5. Step 5: Solve for x
    x = 14,952,065,709.77/138,601.85
  6. Step 6: Final answer
    x = 107,877.83

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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.