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Finding the Fourth Proportional to 135,988.85, 187,610.85 and 78,617.61

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Solution

The fourth proportional to 135,988.85, 187,610.85 and 78,617.61 is: 108,461.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,988.85 : 187,610.85 = 78,617.61 : x
  2. Step 2: Convert to fraction form
    135,988.85/187,610.85 = 78,617.61/x
  3. Step 3: Cross multiply
    135,988.85x = 187,610.85 × 78,617.61
  4. Step 4: Simplify right side
    135,988.85x = 14,749,516,637.07
  5. Step 5: Solve for x
    x = 14,749,516,637.07/135,988.85
  6. Step 6: Final answer
    x = 108,461.22

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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.