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Finding the Fourth Proportional to 128,438.51, 192,575.73 and 61,745.93

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Solution

The fourth proportional to 128,438.51, 192,575.73 and 61,745.93 is: 92,579.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,438.51 : 192,575.73 = 61,745.93 : x
  2. Step 2: Convert to fraction form
    128,438.51/192,575.73 = 61,745.93/x
  3. Step 3: Cross multiply
    128,438.51x = 192,575.73 × 61,745.93
  4. Step 4: Simplify right side
    128,438.51x = 11,890,767,544.28
  5. Step 5: Solve for x
    x = 11,890,767,544.28/128,438.51
  6. Step 6: Final answer
    x = 92,579.46

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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.