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Finding the Fourth Proportional to 111,969.60, 154,518 and 61,668

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Solution

The fourth proportional to 111,969.60, 154,518 and 61,668 is: 85,101.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,969.60 : 154,518 = 61,668 : x
  2. Step 2: Convert to fraction form
    111,969.60/154,518 = 61,668/x
  3. Step 3: Cross multiply
    111,969.60x = 154,518 × 61,668
  4. Step 4: Simplify right side
    111,969.60x = 9,528,816,024
  5. Step 5: Solve for x
    x = 9,528,816,024/111,969.60
  6. Step 6: Final answer
    x = 85,101.81

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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.