Home / 129,412.80-194,119.20-76,881.60

Finding the Fourth Proportional to 129,412.80, 194,119.20 and 76,881.60

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Solution

The fourth proportional to 129,412.80, 194,119.20 and 76,881.60 is: 115,322.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,412.80 : 194,119.20 = 76,881.60 : x
  2. Step 2: Convert to fraction form
    129,412.80/194,119.20 = 76,881.60/x
  3. Step 3: Cross multiply
    129,412.80x = 194,119.20 × 76,881.60
  4. Step 4: Simplify right side
    129,412.80x = 14,924,194,686.72
  5. Step 5: Solve for x
    x = 14,924,194,686.72/129,412.80
  6. Step 6: Final answer
    x = 115,322.40

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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.