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Finding the Fourth Proportional to 78,971.34, 118,512.37 and 45,645.56

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Solution

The fourth proportional to 78,971.34, 118,512.37 and 45,645.56 is: 68,500.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,971.34 : 118,512.37 = 45,645.56 : x
  2. Step 2: Convert to fraction form
    78,971.34/118,512.37 = 45,645.56/x
  3. Step 3: Cross multiply
    78,971.34x = 118,512.37 × 45,645.56
  4. Step 4: Simplify right side
    78,971.34x = 5,409,563,404.49
  5. Step 5: Solve for x
    x = 5,409,563,404.49/78,971.34
  6. Step 6: Final answer
    x = 68,500.33

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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.