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Finding the Fourth Proportional to 77,420.73, 115,606.92 and 61,446.60

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Solution

The fourth proportional to 77,420.73, 115,606.92 and 61,446.60 is: 91,753.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,420.73 : 115,606.92 = 61,446.60 : x
  2. Step 2: Convert to fraction form
    77,420.73/115,606.92 = 61,446.60/x
  3. Step 3: Cross multiply
    77,420.73x = 115,606.92 × 61,446.60
  4. Step 4: Simplify right side
    77,420.73x = 7,103,652,170.47
  5. Step 5: Solve for x
    x = 7,103,652,170.47/77,420.73
  6. Step 6: Final answer
    x = 91,753.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.