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Finding the Fourth Proportional to 138,615.18, 207,917.91 and 45,118.50

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Solution

The fourth proportional to 138,615.18, 207,917.91 and 45,118.50 is: 67,676.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,615.18 : 207,917.91 = 45,118.50 : x
  2. Step 2: Convert to fraction form
    138,615.18/207,917.91 = 45,118.50/x
  3. Step 3: Cross multiply
    138,615.18x = 207,917.91 × 45,118.50
  4. Step 4: Simplify right side
    138,615.18x = 9,380,944,222.34
  5. Step 5: Solve for x
    x = 9,380,944,222.34/138,615.18
  6. Step 6: Final answer
    x = 67,676.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.