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Finding the Fourth Proportional to 80,934.40, 121,401.60 and 76,009.60

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Solution

The fourth proportional to 80,934.40, 121,401.60 and 76,009.60 is: 114,014.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,934.40 : 121,401.60 = 76,009.60 : x
  2. Step 2: Convert to fraction form
    80,934.40/121,401.60 = 76,009.60/x
  3. Step 3: Cross multiply
    80,934.40x = 121,401.60 × 76,009.60
  4. Step 4: Simplify right side
    80,934.40x = 9,227,687,055.36
  5. Step 5: Solve for x
    x = 9,227,687,055.36/80,934.40
  6. Step 6: Final answer
    x = 114,014.40

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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.