Home / 135,987.09-187,608.44-78,615.86

Finding the Fourth Proportional to 135,987.09, 187,608.44 and 78,615.86

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Solution

The fourth proportional to 135,987.09, 187,608.44 and 78,615.86 is: 108,458.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,987.09 : 187,608.44 = 78,615.86 : x
  2. Step 2: Convert to fraction form
    135,987.09/187,608.44 = 78,615.86/x
  3. Step 3: Cross multiply
    135,987.09x = 187,608.44 × 78,615.86
  4. Step 4: Simplify right side
    135,987.09x = 14,748,997,915.82
  5. Step 5: Solve for x
    x = 14,748,997,915.82/135,987.09
  6. Step 6: Final answer
    x = 108,458.81

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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.