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Finding the Fourth Proportional to 111,991.75, 154,548.62 and 61,690.75

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Solution

The fourth proportional to 111,991.75, 154,548.62 and 61,690.75 is: 85,133.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,991.75 : 154,548.62 = 61,690.75 : x
  2. Step 2: Convert to fraction form
    111,991.75/154,548.62 = 61,690.75/x
  3. Step 3: Cross multiply
    111,991.75x = 154,548.62 × 61,690.75
  4. Step 4: Simplify right side
    111,991.75x = 9,534,220,279.27
  5. Step 5: Solve for x
    x = 9,534,220,279.27/111,991.75
  6. Step 6: Final answer
    x = 85,133.24

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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.