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Finding the Fourth Proportional to 81,374.52, 121,984.80 and 61,352.92

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Solution

The fourth proportional to 81,374.52, 121,984.80 and 61,352.92 is: 91,971.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,374.52 : 121,984.80 = 61,352.92 : x
  2. Step 2: Convert to fraction form
    81,374.52/121,984.80 = 61,352.92/x
  3. Step 3: Cross multiply
    81,374.52x = 121,984.80 × 61,352.92
  4. Step 4: Simplify right side
    81,374.52x = 7,484,123,675.62
  5. Step 5: Solve for x
    x = 7,484,123,675.62/81,374.52
  6. Step 6: Final answer
    x = 91,971.34

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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.