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Finding the Fourth Proportional to 128,515.98, 192,438.63 and 103,418.94

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Solution

The fourth proportional to 128,515.98, 192,438.63 and 103,418.94 is: 154,858.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,515.98 : 192,438.63 = 103,418.94 : x
  2. Step 2: Convert to fraction form
    128,515.98/192,438.63 = 103,418.94/x
  3. Step 3: Cross multiply
    128,515.98x = 192,438.63 × 103,418.94
  4. Step 4: Simplify right side
    128,515.98x = 19,901,799,129.65
  5. Step 5: Solve for x
    x = 19,901,799,129.65/128,515.98
  6. Step 6: Final answer
    x = 154,858.56

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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.