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Finding the Fourth Proportional to 111,909.36, 154,435.50 and 61,608.36

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Solution

The fourth proportional to 111,909.36, 154,435.50 and 61,608.36 is: 85,019.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,909.36 : 154,435.50 = 61,608.36 : x
  2. Step 2: Convert to fraction form
    111,909.36/154,435.50 = 61,608.36/x
  3. Step 3: Cross multiply
    111,909.36x = 154,435.50 × 61,608.36
  4. Step 4: Simplify right side
    111,909.36x = 9,514,517,880.78
  5. Step 5: Solve for x
    x = 9,514,517,880.78/111,909.36
  6. Step 6: Final answer
    x = 85,019.86

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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.