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Finding the Fourth Proportional to 78,796.80, 108,604.80 and 61,689.60

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Solution

The fourth proportional to 78,796.80, 108,604.80 and 61,689.60 is: 85,026.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,796.80 : 108,604.80 = 61,689.60 : x
  2. Step 2: Convert to fraction form
    78,796.80/108,604.80 = 61,689.60/x
  3. Step 3: Cross multiply
    78,796.80x = 108,604.80 × 61,689.60
  4. Step 4: Simplify right side
    78,796.80x = 6,699,786,670.08
  5. Step 5: Solve for x
    x = 6,699,786,670.08/78,796.80
  6. Step 6: Final answer
    x = 85,026.13

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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.