Home / 80,780.10-121,161.60-21,621.75

Finding the Fourth Proportional to 80,780.10, 121,161.60 and 21,621.75

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Solution

The fourth proportional to 80,780.10, 121,161.60 and 21,621.75 is: 32,430.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,780.10 : 121,161.60 = 21,621.75 : x
  2. Step 2: Convert to fraction form
    80,780.10/121,161.60 = 21,621.75/x
  3. Step 3: Cross multiply
    80,780.10x = 121,161.60 × 21,621.75
  4. Step 4: Simplify right side
    80,780.10x = 2,619,725,824.80
  5. Step 5: Solve for x
    x = 2,619,725,824.80/80,780.10
  6. Step 6: Final answer
    x = 32,430.34

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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.