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Finding the Fourth Proportional to 78,722, 108,636.40 and 43,394

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Solution

The fourth proportional to 78,722, 108,636.40 and 43,394 is: 59,883.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,722 : 108,636.40 = 43,394 : x
  2. Step 2: Convert to fraction form
    78,722/108,636.40 = 43,394/x
  3. Step 3: Cross multiply
    78,722x = 108,636.40 × 43,394
  4. Step 4: Simplify right side
    78,722x = 4,714,167,941.60
  5. Step 5: Solve for x
    x = 4,714,167,941.60/78,722
  6. Step 6: Final answer
    x = 59,883.74

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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.