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Finding the Fourth Proportional to 92,488.80, 138,538.80 and 76,936.80

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Solution

The fourth proportional to 92,488.80, 138,538.80 and 76,936.80 is: 115,243.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,488.80 : 138,538.80 = 76,936.80 : x
  2. Step 2: Convert to fraction form
    92,488.80/138,538.80 = 76,936.80/x
  3. Step 3: Cross multiply
    92,488.80x = 138,538.80 × 76,936.80
  4. Step 4: Simplify right side
    92,488.80x = 10,658,731,947.84
  5. Step 5: Solve for x
    x = 10,658,731,947.84/92,488.80
  6. Step 6: Final answer
    x = 115,243.49

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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.