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Finding the Fourth Proportional to 78,940.60, 108,936.16 and 43,130.68

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Solution

The fourth proportional to 78,940.60, 108,936.16 and 43,130.68 is: 59,519.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,940.60 : 108,936.16 = 43,130.68 : x
  2. Step 2: Convert to fraction form
    78,940.60/108,936.16 = 43,130.68/x
  3. Step 3: Cross multiply
    78,940.60x = 108,936.16 × 43,130.68
  4. Step 4: Simplify right side
    78,940.60x = 4,698,490,657.39
  5. Step 5: Solve for x
    x = 4,698,490,657.39/78,940.60
  6. Step 6: Final answer
    x = 59,519.32

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1.5x scale

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.