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Finding the Fourth Proportional to 138,763.55, 191,530.67 and 78,369.54

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Solution

The fourth proportional to 138,763.55, 191,530.67 and 78,369.54 is: 108,170.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,763.55 : 191,530.67 = 78,369.54 : x
  2. Step 2: Convert to fraction form
    138,763.55/191,530.67 = 78,369.54/x
  3. Step 3: Cross multiply
    138,763.55x = 191,530.67 × 78,369.54
  4. Step 4: Simplify right side
    138,763.55x = 15,010,170,111.94
  5. Step 5: Solve for x
    x = 15,010,170,111.94/138,763.55
  6. Step 6: Final answer
    x = 108,170.85

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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.