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Finding the Fourth Proportional to 76,830.60, 115,245.70 and 21,426.60

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Solution

The fourth proportional to 76,830.60, 115,245.70 and 21,426.60 is: 32,139.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,830.60 : 115,245.70 = 21,426.60 : x
  2. Step 2: Convert to fraction form
    76,830.60/115,245.70 = 21,426.60/x
  3. Step 3: Cross multiply
    76,830.60x = 115,245.70 × 21,426.60
  4. Step 4: Simplify right side
    76,830.60x = 2,469,323,515.62
  5. Step 5: Solve for x
    x = 2,469,323,515.62/76,830.60
  6. Step 6: Final answer
    x = 32,139.84

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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.