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Finding the Fourth Proportional to 78,909.93, 118,365.21 and 19,745.43

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Solution

The fourth proportional to 78,909.93, 118,365.21 and 19,745.43 is: 29,618.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,909.93 : 118,365.21 = 19,745.43 : x
  2. Step 2: Convert to fraction form
    78,909.93/118,365.21 = 19,745.43/x
  3. Step 3: Cross multiply
    78,909.93x = 118,365.21 × 19,745.43
  4. Step 4: Simplify right side
    78,909.93x = 2,337,171,968.49
  5. Step 5: Solve for x
    x = 2,337,171,968.49/78,909.93
  6. Step 6: Final answer
    x = 29,618.22

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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.