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Finding the Fourth Proportional to 81,881.92, 122,889.08 and 42,450.31

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Solution

The fourth proportional to 81,881.92, 122,889.08 and 42,450.31 is: 63,709.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,881.92 : 122,889.08 = 42,450.31 : x
  2. Step 2: Convert to fraction form
    81,881.92/122,889.08 = 42,450.31/x
  3. Step 3: Cross multiply
    81,881.92x = 122,889.08 × 42,450.31
  4. Step 4: Simplify right side
    81,881.92x = 5,216,679,541.61
  5. Step 5: Solve for x
    x = 5,216,679,541.61/81,881.92
  6. Step 6: Final answer
    x = 63,709.79

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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.