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Finding the Fourth Proportional to 109,321.80, 163,982.70 and 91,825.80

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Solution

The fourth proportional to 109,321.80, 163,982.70 and 91,825.80 is: 137,738.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,321.80 : 163,982.70 = 91,825.80 : x
  2. Step 2: Convert to fraction form
    109,321.80/163,982.70 = 91,825.80/x
  3. Step 3: Cross multiply
    109,321.80x = 163,982.70 × 91,825.80
  4. Step 4: Simplify right side
    109,321.80x = 15,057,842,613.66
  5. Step 5: Solve for x
    x = 15,057,842,613.66/109,321.80
  6. Step 6: Final answer
    x = 137,738.70

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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.