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Finding the Fourth Proportional to 135,590, 187,121.04 and 78,207.92

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Solution

The fourth proportional to 135,590, 187,121.04 and 78,207.92 is: 107,930.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,590 : 187,121.04 = 78,207.92 : x
  2. Step 2: Convert to fraction form
    135,590/187,121.04 = 78,207.92/x
  3. Step 3: Cross multiply
    135,590x = 187,121.04 × 78,207.92
  4. Step 4: Simplify right side
    135,590x = 14,634,347,326.64
  5. Step 5: Solve for x
    x = 14,634,347,326.64/135,590
  6. Step 6: Final answer
    x = 107,930.87

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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.