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Finding the Fourth Proportional to 111,908.64, 154,434.96 and 61,608

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Solution

The fourth proportional to 111,908.64, 154,434.96 and 61,608 is: 85,019.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,908.64 : 154,434.96 = 61,608 : x
  2. Step 2: Convert to fraction form
    111,908.64/154,434.96 = 61,608/x
  3. Step 3: Cross multiply
    111,908.64x = 154,434.96 × 61,608
  4. Step 4: Simplify right side
    111,908.64x = 9,514,429,015.68
  5. Step 5: Solve for x
    x = 9,514,429,015.68/111,908.64
  6. Step 6: Final answer
    x = 85,019.61

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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.