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Finding the Fourth Proportional to 78,600.60, 117,908.10 and 31,843.80

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Solution

The fourth proportional to 78,600.60, 117,908.10 and 31,843.80 is: 47,768.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,600.60 : 117,908.10 = 31,843.80 : x
  2. Step 2: Convert to fraction form
    78,600.60/117,908.10 = 31,843.80/x
  3. Step 3: Cross multiply
    78,600.60x = 117,908.10 × 31,843.80
  4. Step 4: Simplify right side
    78,600.60x = 3,754,641,954.78
  5. Step 5: Solve for x
    x = 3,754,641,954.78/78,600.60
  6. Step 6: Final answer
    x = 47,768.62

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1.5x scale

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.