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Finding the Fourth Proportional to 128,246.77, 192,421.32 and 53,418.52

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Solution

The fourth proportional to 128,246.77, 192,421.32 and 53,418.52 is: 80,149.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,246.77 : 192,421.32 = 53,418.52 : x
  2. Step 2: Convert to fraction form
    128,246.77/192,421.32 = 53,418.52/x
  3. Step 3: Cross multiply
    128,246.77x = 192,421.32 × 53,418.52
  4. Step 4: Simplify right side
    128,246.77x = 10,278,862,130.85
  5. Step 5: Solve for x
    x = 10,278,862,130.85/128,246.77
  6. Step 6: Final answer
    x = 80,149.09

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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.