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Finding the Fourth Proportional to 135,987.35, 187,608.78 and 78,616.11

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Solution

The fourth proportional to 135,987.35, 187,608.78 and 78,616.11 is: 108,459.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,987.35 : 187,608.78 = 78,616.11 : x
  2. Step 2: Convert to fraction form
    135,987.35/187,608.78 = 78,616.11/x
  3. Step 3: Cross multiply
    135,987.35x = 187,608.78 × 78,616.11
  4. Step 4: Simplify right side
    135,987.35x = 14,749,072,485.45
  5. Step 5: Solve for x
    x = 14,749,072,485.45/135,987.35
  6. Step 6: Final answer
    x = 108,459.15

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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.