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Finding the Fourth Proportional to 81,103.80, 121,655.70 and 31,207.40

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Solution

The fourth proportional to 81,103.80, 121,655.70 and 31,207.40 is: 46,811.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,103.80 : 121,655.70 = 31,207.40 : x
  2. Step 2: Convert to fraction form
    81,103.80/121,655.70 = 31,207.40/x
  3. Step 3: Cross multiply
    81,103.80x = 121,655.70 × 31,207.40
  4. Step 4: Simplify right side
    81,103.80x = 3,796,558,092.18
  5. Step 5: Solve for x
    x = 3,796,558,092.18/81,103.80
  6. Step 6: Final answer
    x = 46,811.10

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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.