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Finding the Fourth Proportional to 80,967.09, 120,636.54 and 76,440

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Solution

The fourth proportional to 80,967.09, 120,636.54 and 76,440 is: 113,891.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,967.09 : 120,636.54 = 76,440 : x
  2. Step 2: Convert to fraction form
    80,967.09/120,636.54 = 76,440/x
  3. Step 3: Cross multiply
    80,967.09x = 120,636.54 × 76,440
  4. Step 4: Simplify right side
    80,967.09x = 9,221,457,117.60
  5. Step 5: Solve for x
    x = 9,221,457,117.60/80,967.09
  6. Step 6: Final answer
    x = 113,891.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.