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Finding the Fourth Proportional to 138,142.72, 190,648.02 and 77,709.76

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Solution

The fourth proportional to 138,142.72, 190,648.02 and 77,709.76 is: 107,245.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,142.72 : 190,648.02 = 77,709.76 : x
  2. Step 2: Convert to fraction form
    138,142.72/190,648.02 = 77,709.76/x
  3. Step 3: Cross multiply
    138,142.72x = 190,648.02 × 77,709.76
  4. Step 4: Simplify right side
    138,142.72x = 14,815,211,878.68
  5. Step 5: Solve for x
    x = 14,815,211,878.68/138,142.72
  6. Step 6: Final answer
    x = 107,245.69

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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.