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Finding the Fourth Proportional to 81,047.58, 121,531.68 and 28,449.42

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Solution

The fourth proportional to 81,047.58, 121,531.68 and 28,449.42 is: 42,660.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,047.58 : 121,531.68 = 28,449.42 : x
  2. Step 2: Convert to fraction form
    81,047.58/121,531.68 = 28,449.42/x
  3. Step 3: Cross multiply
    81,047.58x = 121,531.68 × 28,449.42
  4. Step 4: Simplify right side
    81,047.58x = 3,457,505,807.63
  5. Step 5: Solve for x
    x = 3,457,505,807.63/81,047.58
  6. Step 6: Final answer
    x = 42,660.20

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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.