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Finding the Fourth Proportional to 81,385.40, 121,980.90 and 41,922.20

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Solution

The fourth proportional to 81,385.40, 121,980.90 and 41,922.20 is: 62,833.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,385.40 : 121,980.90 = 41,922.20 : x
  2. Step 2: Convert to fraction form
    81,385.40/121,980.90 = 41,922.20/x
  3. Step 3: Cross multiply
    81,385.40x = 121,980.90 × 41,922.20
  4. Step 4: Simplify right side
    81,385.40x = 5,113,707,685.98
  5. Step 5: Solve for x
    x = 5,113,707,685.98/81,385.40
  6. Step 6: Final answer
    x = 62,833.23

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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.