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Finding the Fourth Proportional to 80,939.60, 121,409.40 and 80,421.20

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Solution

The fourth proportional to 80,939.60, 121,409.40 and 80,421.20 is: 120,631.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,939.60 : 121,409.40 = 80,421.20 : x
  2. Step 2: Convert to fraction form
    80,939.60/121,409.40 = 80,421.20/x
  3. Step 3: Cross multiply
    80,939.60x = 121,409.40 × 80,421.20
  4. Step 4: Simplify right side
    80,939.60x = 9,763,889,639.28
  5. Step 5: Solve for x
    x = 9,763,889,639.28/80,939.60
  6. Step 6: Final answer
    x = 120,631.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.