Home / 76,971.20-115,456.80-72,305.60

Finding the Fourth Proportional to 76,971.20, 115,456.80 and 72,305.60

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Solution

The fourth proportional to 76,971.20, 115,456.80 and 72,305.60 is: 108,458.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,971.20 : 115,456.80 = 72,305.60 : x
  2. Step 2: Convert to fraction form
    76,971.20/115,456.80 = 72,305.60/x
  3. Step 3: Cross multiply
    76,971.20x = 115,456.80 × 72,305.60
  4. Step 4: Simplify right side
    76,971.20x = 8,348,173,198.08
  5. Step 5: Solve for x
    x = 8,348,173,198.08/76,971.20
  6. Step 6: Final answer
    x = 108,458.40

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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.