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Finding the Fourth Proportional to 81,755.40, 122,711.40 and 42,340.80

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Solution

The fourth proportional to 81,755.40, 122,711.40 and 42,340.80 is: 63,551.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,755.40 : 122,711.40 = 42,340.80 : x
  2. Step 2: Convert to fraction form
    81,755.40/122,711.40 = 42,340.80/x
  3. Step 3: Cross multiply
    81,755.40x = 122,711.40 × 42,340.80
  4. Step 4: Simplify right side
    81,755.40x = 5,195,698,845.12
  5. Step 5: Solve for x
    x = 5,195,698,845.12/81,755.40
  6. Step 6: Final answer
    x = 63,551.75

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1.5x scale

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.