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Finding the Fourth Proportional to 78,791.85, 118,195.11 and 31,395.51

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Solution

The fourth proportional to 78,791.85, 118,195.11 and 31,395.51 is: 47,096.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,791.85 : 118,195.11 = 31,395.51 : x
  2. Step 2: Convert to fraction form
    78,791.85/118,195.11 = 31,395.51/x
  3. Step 3: Cross multiply
    78,791.85x = 118,195.11 × 31,395.51
  4. Step 4: Simplify right side
    78,791.85x = 3,710,795,757.96
  5. Step 5: Solve for x
    x = 3,710,795,757.96/78,791.85
  6. Step 6: Final answer
    x = 47,096.19

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1.5x scale

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.