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Finding the Fourth Proportional to 79,138.80, 118,679.40 and 39,682.80

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Solution

The fourth proportional to 79,138.80, 118,679.40 and 39,682.80 is: 59,509.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,138.80 : 118,679.40 = 39,682.80 : x
  2. Step 2: Convert to fraction form
    79,138.80/118,679.40 = 39,682.80/x
  3. Step 3: Cross multiply
    79,138.80x = 118,679.40 × 39,682.80
  4. Step 4: Simplify right side
    79,138.80x = 4,709,530,894.32
  5. Step 5: Solve for x
    x = 4,709,530,894.32/79,138.80
  6. Step 6: Final answer
    x = 59,509.76

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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.