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Finding the Fourth Proportional to 78,957.55, 108,961.20 and 43,147.79

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Solution

The fourth proportional to 78,957.55, 108,961.20 and 43,147.79 is: 59,543.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,957.55 : 108,961.20 = 43,147.79 : x
  2. Step 2: Convert to fraction form
    78,957.55/108,961.20 = 43,147.79/x
  3. Step 3: Cross multiply
    78,957.55x = 108,961.20 × 43,147.79
  4. Step 4: Simplify right side
    78,957.55x = 4,701,434,975.75
  5. Step 5: Solve for x
    x = 4,701,434,975.75/78,957.55
  6. Step 6: Final answer
    x = 59,543.83

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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.