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Finding the Fourth Proportional to 78,958.58, 108,958.20 and 43,148.86

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Solution

The fourth proportional to 78,958.58, 108,958.20 and 43,148.86 is: 59,542.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,958.58 : 108,958.20 = 43,148.86 : x
  2. Step 2: Convert to fraction form
    78,958.58/108,958.20 = 43,148.86/x
  3. Step 3: Cross multiply
    78,958.58x = 108,958.20 × 43,148.86
  4. Step 4: Simplify right side
    78,958.58x = 4,701,422,117.65
  5. Step 5: Solve for x
    x = 4,701,422,117.65/78,958.58
  6. Step 6: Final answer
    x = 59,542.89

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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.