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Finding the Fourth Proportional to 135,987.84, 187,609.48 and 78,616.61

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Solution

The fourth proportional to 135,987.84, 187,609.48 and 78,616.61 is: 108,459.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,987.84 : 187,609.48 = 78,616.61 : x
  2. Step 2: Convert to fraction form
    135,987.84/187,609.48 = 78,616.61/x
  3. Step 3: Cross multiply
    135,987.84x = 187,609.48 × 78,616.61
  4. Step 4: Simplify right side
    135,987.84x = 14,749,219,990.33
  5. Step 5: Solve for x
    x = 14,749,219,990.33/135,987.84
  6. Step 6: Final answer
    x = 108,459.84

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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.