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Finding the Fourth Proportional to 78,738.60, 118,073.25 and 28,805.74

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Solution

The fourth proportional to 78,738.60, 118,073.25 and 28,805.74 is: 43,195.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,738.60 : 118,073.25 = 28,805.74 : x
  2. Step 2: Convert to fraction form
    78,738.60/118,073.25 = 28,805.74/x
  3. Step 3: Cross multiply
    78,738.60x = 118,073.25 × 28,805.74
  4. Step 4: Simplify right side
    78,738.60x = 3,401,187,340.46
  5. Step 5: Solve for x
    x = 3,401,187,340.46/78,738.60
  6. Step 6: Final answer
    x = 43,195.93

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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.