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Finding the Fourth Proportional to 81,364.50, 121,969.80 and 61,342.92

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Solution

The fourth proportional to 81,364.50, 121,969.80 and 61,342.92 is: 91,956.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,364.50 : 121,969.80 = 61,342.92 : x
  2. Step 2: Convert to fraction form
    81,364.50/121,969.80 = 61,342.92/x
  3. Step 3: Cross multiply
    81,364.50x = 121,969.80 × 61,342.92
  4. Step 4: Simplify right side
    81,364.50x = 7,481,983,683.82
  5. Step 5: Solve for x
    x = 7,481,983,683.82/81,364.50
  6. Step 6: Final answer
    x = 91,956.37

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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.