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Finding the Fourth Proportional to 78,954.80, 108,957.78 and 43,145.40

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Solution

The fourth proportional to 78,954.80, 108,957.78 and 43,145.40 is: 59,540.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,954.80 : 108,957.78 = 43,145.40 : x
  2. Step 2: Convert to fraction form
    78,954.80/108,957.78 = 43,145.40/x
  3. Step 3: Cross multiply
    78,954.80x = 108,957.78 × 43,145.40
  4. Step 4: Simplify right side
    78,954.80x = 4,701,027,001.21
  5. Step 5: Solve for x
    x = 4,701,027,001.21/78,954.80
  6. Step 6: Final answer
    x = 59,540.74

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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.