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Finding the Fourth Proportional to 81,281.80, 121,922.70 and 34,625.80

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Solution

The fourth proportional to 81,281.80, 121,922.70 and 34,625.80 is: 51,938.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,281.80 : 121,922.70 = 34,625.80 : x
  2. Step 2: Convert to fraction form
    81,281.80/121,922.70 = 34,625.80/x
  3. Step 3: Cross multiply
    81,281.80x = 121,922.70 × 34,625.80
  4. Step 4: Simplify right side
    81,281.80x = 4,221,671,025.66
  5. Step 5: Solve for x
    x = 4,221,671,025.66/81,281.80
  6. Step 6: Final answer
    x = 51,938.70

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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.