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Finding the Fourth Proportional to 78,869.57, 108,838.49 and 43,059.80

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Solution

The fourth proportional to 78,869.57, 108,838.49 and 43,059.80 is: 59,421.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,869.57 : 108,838.49 = 43,059.80 : x
  2. Step 2: Convert to fraction form
    78,869.57/108,838.49 = 43,059.80/x
  3. Step 3: Cross multiply
    78,869.57x = 108,838.49 × 43,059.80
  4. Step 4: Simplify right side
    78,869.57x = 4,686,563,668.50
  5. Step 5: Solve for x
    x = 4,686,563,668.50/78,869.57
  6. Step 6: Final answer
    x = 59,421.70

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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.