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Finding the Fourth Proportional to 121,909.20, 182,863.80 and 38,811.60

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Solution

The fourth proportional to 121,909.20, 182,863.80 and 38,811.60 is: 58,217.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,909.20 : 182,863.80 = 38,811.60 : x
  2. Step 2: Convert to fraction form
    121,909.20/182,863.80 = 38,811.60/x
  3. Step 3: Cross multiply
    121,909.20x = 182,863.80 × 38,811.60
  4. Step 4: Simplify right side
    121,909.20x = 7,097,236,660.08
  5. Step 5: Solve for x
    x = 7,097,236,660.08/121,909.20
  6. Step 6: Final answer
    x = 58,217.40

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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.