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Finding the Fourth Proportional to 81,421.76, 122,760.32 and 80,916.32

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Solution

The fourth proportional to 81,421.76, 122,760.32 and 80,916.32 is: 121,998.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,421.76 : 122,760.32 = 80,916.32 : x
  2. Step 2: Convert to fraction form
    81,421.76/122,760.32 = 80,916.32/x
  3. Step 3: Cross multiply
    81,421.76x = 122,760.32 × 80,916.32
  4. Step 4: Simplify right side
    81,421.76x = 9,933,313,336.42
  5. Step 5: Solve for x
    x = 9,933,313,336.42/81,421.76
  6. Step 6: Final answer
    x = 121,998.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.