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Finding the Fourth Proportional to 136,219.96, 187,980.62 and 78,861.71

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Solution

The fourth proportional to 136,219.96, 187,980.62 and 78,861.71 is: 108,827.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,219.96 : 187,980.62 = 78,861.71 : x
  2. Step 2: Convert to fraction form
    136,219.96/187,980.62 = 78,861.71/x
  3. Step 3: Cross multiply
    136,219.96x = 187,980.62 × 78,861.71
  4. Step 4: Simplify right side
    136,219.96x = 14,824,472,609.35
  5. Step 5: Solve for x
    x = 14,824,472,609.35/136,219.96
  6. Step 6: Final answer
    x = 108,827.46

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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.