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Finding the Fourth Proportional to 81,330.80, 121,938.60 and 31,391.60

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Solution

The fourth proportional to 81,330.80, 121,938.60 and 31,391.60 is: 47,065.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,330.80 : 121,938.60 = 31,391.60 : x
  2. Step 2: Convert to fraction form
    81,330.80/121,938.60 = 31,391.60/x
  3. Step 3: Cross multiply
    81,330.80x = 121,938.60 × 31,391.60
  4. Step 4: Simplify right side
    81,330.80x = 3,827,847,755.76
  5. Step 5: Solve for x
    x = 3,827,847,755.76/81,330.80
  6. Step 6: Final answer
    x = 47,065.17

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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.