Home / 138,835.80-191,611.30-78,421.96

Finding the Fourth Proportional to 138,835.80, 191,611.30 and 78,421.96

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Solution

The fourth proportional to 138,835.80, 191,611.30 and 78,421.96 is: 108,232.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,835.80 : 191,611.30 = 78,421.96 : x
  2. Step 2: Convert to fraction form
    138,835.80/191,611.30 = 78,421.96/x
  3. Step 3: Cross multiply
    138,835.80x = 191,611.30 × 78,421.96
  4. Step 4: Simplify right side
    138,835.80x = 15,026,533,704.15
  5. Step 5: Solve for x
    x = 15,026,533,704.15/138,835.80
  6. Step 6: Final answer
    x = 108,232.41

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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.