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Finding the Fourth Proportional to 81,245.52, 121,878.36 and 28,644.48

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Solution

The fourth proportional to 81,245.52, 121,878.36 and 28,644.48 is: 42,970.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,245.52 : 121,878.36 = 28,644.48 : x
  2. Step 2: Convert to fraction form
    81,245.52/121,878.36 = 28,644.48/x
  3. Step 3: Cross multiply
    81,245.52x = 121,878.36 × 28,644.48
  4. Step 4: Simplify right side
    81,245.52x = 3,491,142,245.45
  5. Step 5: Solve for x
    x = 3,491,142,245.45/81,245.52
  6. Step 6: Final answer
    x = 42,970.27

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1.5x scale

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.