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Finding the Fourth Proportional to 138,339.60, 190,909.00 and 80,968.51

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Solution

The fourth proportional to 138,339.60, 190,909.00 and 80,968.51 is: 111,736.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,339.60 : 190,909.00 = 80,968.51 : x
  2. Step 2: Convert to fraction form
    138,339.60/190,909.00 = 80,968.51/x
  3. Step 3: Cross multiply
    138,339.60x = 190,909.00 × 80,968.51
  4. Step 4: Simplify right side
    138,339.60x = 15,457,617,615.44
  5. Step 5: Solve for x
    x = 15,457,617,615.44/138,339.60
  6. Step 6: Final answer
    x = 111,736.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.