Home / 138,731.40-191,450-78,304.60

Finding the Fourth Proportional to 138,731.40, 191,450 and 78,304.60

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Solution

The fourth proportional to 138,731.40, 191,450 and 78,304.60 is: 108,060.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,731.40 : 191,450 = 78,304.60 : x
  2. Step 2: Convert to fraction form
    138,731.40/191,450 = 78,304.60/x
  3. Step 3: Cross multiply
    138,731.40x = 191,450 × 78,304.60
  4. Step 4: Simplify right side
    138,731.40x = 14,991,415,670.00
  5. Step 5: Solve for x
    x = 14,991,415,670.00/138,731.40
  6. Step 6: Final answer
    x = 108,060.73

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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.