Home / 138,571.56-191,215.35-78,151.64

Finding the Fourth Proportional to 138,571.56, 191,215.35 and 78,151.64

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Solution

The fourth proportional to 138,571.56, 191,215.35 and 78,151.64 is: 107,841.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,571.56 : 191,215.35 = 78,151.64 : x
  2. Step 2: Convert to fraction form
    138,571.56/191,215.35 = 78,151.64/x
  3. Step 3: Cross multiply
    138,571.56x = 191,215.35 × 78,151.64
  4. Step 4: Simplify right side
    138,571.56x = 14,943,792,239.60
  5. Step 5: Solve for x
    x = 14,943,792,239.60/138,571.56
  6. Step 6: Final answer
    x = 107,841.70

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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.