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Finding the Fourth Proportional to 78,745.67, 108,666.65 and 42,936.38

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Solution

The fourth proportional to 78,745.67, 108,666.65 and 42,936.38 is: 59,250.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,745.67 : 108,666.65 = 42,936.38 : x
  2. Step 2: Convert to fraction form
    78,745.67/108,666.65 = 42,936.38/x
  3. Step 3: Cross multiply
    78,745.67x = 108,666.65 × 42,936.38
  4. Step 4: Simplify right side
    78,745.67x = 4,665,751,819.71
  5. Step 5: Solve for x
    x = 4,665,751,819.71/78,745.67
  6. Step 6: Final answer
    x = 59,250.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.