Home / 81,281.64-121,922.46-28,657.56

Finding the Fourth Proportional to 81,281.64, 121,922.46 and 28,657.56

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Solution

The fourth proportional to 81,281.64, 121,922.46 and 28,657.56 is: 42,986.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,281.64 : 121,922.46 = 28,657.56 : x
  2. Step 2: Convert to fraction form
    81,281.64/121,922.46 = 28,657.56/x
  3. Step 3: Cross multiply
    81,281.64x = 121,922.46 × 28,657.56
  4. Step 4: Simplify right side
    81,281.64x = 3,494,000,212.80
  5. Step 5: Solve for x
    x = 3,494,000,212.80/81,281.64
  6. Step 6: Final answer
    x = 42,986.34

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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.