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Finding the Fourth Proportional to 81,109.80, 121,607.10 and 31,170.60

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Solution

The fourth proportional to 81,109.80, 121,607.10 and 31,170.60 is: 46,733.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,109.80 : 121,607.10 = 31,170.60 : x
  2. Step 2: Convert to fraction form
    81,109.80/121,607.10 = 31,170.60/x
  3. Step 3: Cross multiply
    81,109.80x = 121,607.10 × 31,170.60
  4. Step 4: Simplify right side
    81,109.80x = 3,790,566,271.26
  5. Step 5: Solve for x
    x = 3,790,566,271.26/81,109.80
  6. Step 6: Final answer
    x = 46,733.76

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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.