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Finding the Fourth Proportional to 111,910.60, 167,865.90 and 86,541.40

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Solution

The fourth proportional to 111,910.60, 167,865.90 and 86,541.40 is: 129,812.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,910.60 : 167,865.90 = 86,541.40 : x
  2. Step 2: Convert to fraction form
    111,910.60/167,865.90 = 86,541.40/x
  3. Step 3: Cross multiply
    111,910.60x = 167,865.90 × 86,541.40
  4. Step 4: Simplify right side
    111,910.60x = 14,527,349,998.26
  5. Step 5: Solve for x
    x = 14,527,349,998.26/111,910.60
  6. Step 6: Final answer
    x = 129,812.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.