Home / 78,138.12-117,270.04-40,709.38

Finding the Fourth Proportional to 78,138.12, 117,270.04 and 40,709.38

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Solution

The fourth proportional to 78,138.12, 117,270.04 and 40,709.38 is: 61,096.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,138.12 : 117,270.04 = 40,709.38 : x
  2. Step 2: Convert to fraction form
    78,138.12/117,270.04 = 40,709.38/x
  3. Step 3: Cross multiply
    78,138.12x = 117,270.04 × 40,709.38
  4. Step 4: Simplify right side
    78,138.12x = 4,773,990,620.98
  5. Step 5: Solve for x
    x = 4,773,990,620.98/78,138.12
  6. Step 6: Final answer
    x = 61,096.82

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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.