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Finding the Fourth Proportional to 138,319.53, 190,879.06 and 77,890.90

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Solution

The fourth proportional to 138,319.53, 190,879.06 and 77,890.90 is: 107,488.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,319.53 : 190,879.06 = 77,890.90 : x
  2. Step 2: Convert to fraction form
    138,319.53/190,879.06 = 77,890.90/x
  3. Step 3: Cross multiply
    138,319.53x = 190,879.06 × 77,890.90
  4. Step 4: Simplify right side
    138,319.53x = 14,867,741,774.55
  5. Step 5: Solve for x
    x = 14,867,741,774.55/138,319.53
  6. Step 6: Final answer
    x = 107,488.38

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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.